Fair Value Measurements - Level 3 Liabilities Measured at Fair Value on a Recurring Basis (Details) - Level 3 - USD ($)
$ in Millions |
2 Months Ended |
10 Months Ended |
Dec. 15, 2017 |
Sep. 30, 2018 |
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair value of derivative liability, beginning balance |
|
$ 17
|
| Contingent consideration |
|
14
|
| Accretion of interest |
|
1
|
| Change in fair value |
|
17
|
| Fair value of derivative liability, ending balance |
$ 17
|
49
|
| Predecessor |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair value of derivative liability, beginning balance |
0
|
17
|
| Issuance of Emergence Date Warrants |
17
|
|
| Fair value of derivative liability, ending balance |
17
|
|
| Emergence Date Warrants |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair value of derivative liability, beginning balance |
|
17
|
| Contingent consideration |
|
0
|
| Accretion of interest |
|
0
|
| Change in fair value |
|
17
|
| Fair value of derivative liability, ending balance |
17
|
34
|
| Emergence Date Warrants | Predecessor |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair value of derivative liability, beginning balance |
0
|
17
|
| Issuance of Emergence Date Warrants |
17
|
|
| Fair value of derivative liability, ending balance |
17
|
|
| Spoken acquisition Earn-outs |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair value of derivative liability, beginning balance |
|
0
|
| Contingent consideration |
|
14
|
| Accretion of interest |
|
1
|
| Change in fair value |
|
0
|
| Fair value of derivative liability, ending balance |
0
|
15
|
| Spoken acquisition Earn-outs | Predecessor |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair value of derivative liability, beginning balance |
0
|
$ 0
|
| Issuance of Emergence Date Warrants |
0
|
|
| Fair value of derivative liability, ending balance |
$ 0
|
|