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Income Taxes Income Taxes - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Aug. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Successor [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Benefit |  |  | $ (2,716) |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense |  |  | 715 |  |  |
Undistributed Earnings of Foreign Subsidiaries |  | $ 15,408 | 15,408 |  |  |
(Loss) Income from Continuing Operations before Income Taxes, Foreign |  |  | (775) |  |  |
Business Combination, Fair Value Step-Up Of Acquired Inventory, Amount recognized in Cost of Goods sold | $ 360 | $ 1,109 | $ 1,469 |  |  |
Predecessor [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Undistributed Earnings of Foreign Subsidiaries |  |  |  |  | $ 17,380 | $ 16,053
(Loss) Income from Continuing Operations before Income Taxes, Foreign |  |  |  | $ 1,382 | $ 1,308 | $ 721

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