Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($)
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Sep. 30, 2018 |
Jun. 30, 2018 |
Jun. 11, 2018 |
Sep. 30, 2017 |
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
$ 3,253,000,000
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| Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
3,289,000,000
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| Term Loan Credit Agreement due December 15, 2024 |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
2,903,000,000
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| Term Loan Credit Agreement due December 15, 2024 | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
$ 2,932,000,000
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| Convertible 2.25% senior notes due June 15, 2023 |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Interest rate, stated percentage |
2.25%
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2.25%
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| Debt face amount |
$ 350,000,000
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$ 350,000,000
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| Convertible 2.25% senior notes due June 15, 2023 | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
357,000,000
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| DIP Credit Agreement due January 19, 2018 |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
0
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| DIP Credit Agreement due January 19, 2018 | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
0
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| First Lien Debt | Senior secured term B-3 loans |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
0
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| First Lien Debt | Senior secured term B-3 loans | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
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$ 0
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| First Lien Debt | Senior secured term B-4 loans |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
0
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| First Lien Debt | Senior secured term B-4 loans | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
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0
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| First Lien Debt | Senior secured term B-6 loans |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
0
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| First Lien Debt | Senior secured term B-6 loans | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
|
$ 0
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| First Lien Debt | Senior secured term B-7 loans |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
0
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| First Lien Debt | Senior secured term B-7 loans | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
$ 0
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| First Lien Debt | 7% senior secured notes |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Interest rate, stated percentage |
7.00%
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7.00%
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| Debt face amount |
$ 0
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| First Lien Debt | 7% senior secured notes | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
$ 0
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| First Lien Debt | 9% senior secured notes |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Interest rate, stated percentage |
9.00%
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9.00%
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| Debt face amount |
$ 0
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| First Lien Debt | 9% senior secured notes | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
$ 0
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| Second Lien Debt | 10.50% senior secured notes |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Interest rate, stated percentage |
10.50%
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10.50%
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| Debt face amount |
$ 0
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| Second Lien Debt | 10.50% senior secured notes | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
$ 0
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| Predecessor |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
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$ 6,557,000,000
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| Predecessor | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
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|
4,525,000,000
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| Predecessor | Term Loan Credit Agreement due December 15, 2024 |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
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0
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| Predecessor | Term Loan Credit Agreement due December 15, 2024 | Estimate of Fair Value Measurement |
|
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|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Long-term debt, fair value |
|
|
|
0
|
| Predecessor | Convertible 2.25% senior notes due June 15, 2023 |
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Debt face amount |
|
|
|
0
|
| Predecessor | Convertible 2.25% senior notes due June 15, 2023 | Estimate of Fair Value Measurement |
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Long-term debt, fair value |
|
|
|
0
|
| Predecessor | DIP Credit Agreement due January 19, 2018 |
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|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
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|
725,000,000
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| Predecessor | DIP Credit Agreement due January 19, 2018 | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
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|
732,000,000
|
| Predecessor | First Lien Debt | Senior secured term B-3 loans |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
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|
594,000,000
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| Predecessor | First Lien Debt | Senior secured term B-3 loans | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
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|
503,000,000
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| Predecessor | First Lien Debt | Senior secured term B-4 loans |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
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|
1,000,000
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| Predecessor | First Lien Debt | Senior secured term B-4 loans | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Long-term debt, fair value |
|
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|
1,000,000
|
| Predecessor | First Lien Debt | Senior secured term B-6 loans |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
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|
|
519,000,000
|
| Predecessor | First Lien Debt | Senior secured term B-6 loans | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Long-term debt, fair value |
|
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|
440,000,000
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| Predecessor | First Lien Debt | Senior secured term B-7 loans |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
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|
2,012,000,000
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| Predecessor | First Lien Debt | Senior secured term B-7 loans | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Long-term debt, fair value |
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|
1,709,000,000
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| Predecessor | First Lien Debt | 7% senior secured notes |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
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|
982,000,000
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| Predecessor | First Lien Debt | 7% senior secured notes | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
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|
832,000,000
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| Predecessor | First Lien Debt | 9% senior secured notes |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
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|
284,000,000
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| Predecessor | First Lien Debt | 9% senior secured notes | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Long-term debt, fair value |
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|
241,000,000
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| Predecessor | Second Lien Debt | 10.50% senior secured notes |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Debt face amount |
|
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|
1,440,000,000
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| Predecessor | Second Lien Debt | 10.50% senior secured notes | Estimate of Fair Value Measurement |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Long-term debt, fair value |
|
|
|
$ 67,000,000
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