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Stockholders' Equity Tax Benefit (Expense) on Net Activity (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 8 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Aug. 31, 2017 | Sep. 30, 2018 | Aug. 31, 2017 | Sep. 30, 2018
Successor [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) | $ 0 |  | $ 0 |  | $ (1)
Successor [Member] | Derivative Instruments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) | 0 |  | 1 |  | 2
Predecessor [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) |  | $ (32) |  | $ (144) |
Predecessor [Member] | Derivative Instruments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) |  | 0 |  | 6 |
Pension Plan | Successor [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) | 0 |  | (1) |  | (3)
Pension Plan | Predecessor [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) |  | (31) |  | (145) |
Other Benefit Plans | Successor [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) | $ 0 |  | $ 0 |  | $ 0
Other Benefit Plans | Predecessor [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) |  | $ (1) |  | $ (5) |

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