Income Taxes - Income Taxes by Location (Details) - USD ($) $ in Millions |
1 Months Ended | 2 Months Ended | 3 Months Ended | 10 Months Ended | 12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Dec. 15, 2017 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| LOSS BEFORE INCOME TAXES: | ||||||||||||
| U.S. | $ (165) | |||||||||||
| Foreign | (94) | |||||||||||
| (LOSS) INCOME BEFORE INCOME TAXES | (259) | |||||||||||
| CURRENT | ||||||||||||
| Federal | 0 | |||||||||||
| State and local | 4 | |||||||||||
| Foreign | (40) | |||||||||||
| Current income tax provision (benefit) | (36) | |||||||||||
| DEFERRED | ||||||||||||
| Federal | 530 | |||||||||||
| State and local | 34 | |||||||||||
| Foreign | 18 | |||||||||||
| Deferred income tax provision (benefit) | 582 | |||||||||||
| Benefit from (provision for) income taxes | $ 246 | $ 311 | $ (20) | $ 9 | $ 546 | |||||||
| Predecessor | ||||||||||||
| LOSS BEFORE INCOME TAXES: | ||||||||||||
| U.S. | $ 3,353 | $ (275) | $ (769) | |||||||||
| Foreign | 83 | 77 | 50 | |||||||||
| (LOSS) INCOME BEFORE INCOME TAXES | 3,436 | (198) | (719) | |||||||||
| CURRENT | ||||||||||||
| Federal | 0 | 2 | 3 | |||||||||
| State and local | 0 | 1 | (1) | |||||||||
| Foreign | (4) | (27) | (65) | |||||||||
| Current income tax provision (benefit) | (4) | (24) | (63) | |||||||||
| DEFERRED | ||||||||||||
| Federal | (453) | 34 | 72 | |||||||||
| State and local | (19) | 5 | 7 | |||||||||
| Foreign | 17 | 1 | (27) | |||||||||
| Deferred income tax provision (benefit) | (455) | 40 | 52 | |||||||||
| Benefit from (provision for) income taxes | $ (459) | $ (6) | $ 6 | $ 19 | $ (3) | $ 16 | $ (11) | |||||