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