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Income Taxes Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018
Successor [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit) | $ 7 |  |  | $ 55 |  | $ (2,661)
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense |  | $ 715 |  |  |  |
Tax Cuts and Jobs Act of 2017, Indirect Impact on Inventory, Income Tax Expense |  |  |  | $ 16 |  |
Predecessor [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax benefit related to reduction in company's unrecognized tax benefits |  |  |  |  | $ 57 |
Pre tax benefit on associated accrued interest reversals |  |  |  |  | 50 |
Continuing Operations [Member] | Predecessor [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax benefit related to reduction in company's unrecognized tax benefits |  |  |  |  | 53 |
Pre tax benefit on associated accrued interest reversals |  |  |  |  | 47 |
Discontinued Operations [Member] | Predecessor [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax benefit related to reduction in company's unrecognized tax benefits |  |  |  |  | 4 |
Pre tax benefit on associated accrued interest reversals |  |  |  |  | $ 3 |
2016 RTA [Member] | Predecessor [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax expense associated with the elimination of the U.S. domestic manufacturing deduction |  |  | $ 29 |  |  |

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