Income Taxes Income Taxes - Narrative (Details) - USD ($) $ in Millions	1 Months Ended		2 Months Ended	3 Months Ended									4 Months Ended	8 Months Ended	12 Months Ended		16 Months Ended
	Sep. 30, 2017		Aug. 31, 2017	Dec. 31, 2018	Sep. 30, 2018		Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017		Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2018
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		$ 39		$ 2,755
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense													715		144		859
Tax Cuts and Jobs Act of 2017, Indirect Impact on Inventory, Income Tax Expense															16
Goodwill Impairment Charge					$ 4,503	[1]							0		4,503
Business Combination, Fair Value Step-Up Of Acquired Inventory, Amount recognized in Cost of Goods sold	$ 360			$ 134	109		$ 682	$ 703	$ 1,109				1,469		1,628
Integration and Separation Costs	$ 71	[2]		449	$ 344		$ 327	$ 255	243	[2]			314		1,375
Undistributed Earnings of Foreign Subsidiaries				$ 15,565					$ 15,408				$ 15,408		15,565		$ 15,565
Successor [Member] | Domestic
Operating Loss Carryforwards [Line Items]
Goodwill Impairment Charge															3,193
Successor [Member] | Foreign
Operating Loss Carryforwards [Line Items]
Goodwill Impairment Charge															1,310
Predecessor [Member]
Operating Loss Carryforwards [Line Items]
Goodwill Impairment Charge														$ 0		$ 0
Integration and Separation Costs			$ 210								$ 201	$ 170		$ 581		$ 386
Pension Resize [Member] | Successor [Member]
Operating Loss Carryforwards [Line Items]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Benefit (Expense)															114
Repatriation Accrual [Member] | Successor [Member]
Operating Loss Carryforwards [Line Items]
Other Tax Expense															$ 74

[1] See Note 14 for additional information

[2] Integration and separation costs were $170 million, $201 million, and $210 million in the first quarter 2017, second quarter 2017, and the period July 1 - August 31, 2017, respectively. In the Predecessor periods, costs are recorded in selling, general and administrative expenses. See Note 3 for additional information.