Income Taxes Income Taxes - Narrative (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended	12 Months Ended
	Aug. 31, 2017	Sep. 30, 2018	Dec. 31, 2017	Aug. 31, 2017	Sep. 30, 2018	Sep. 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 Benefit		$ 99			$ 44	$ 2,760
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
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		114
Brazil Valuation Allowance [Member] | Successor [Member]
Operating Loss Carryforwards [Line Items]
Other Tax Expense		75			75
Repatriation Accrual [Member] | Successor [Member]
Operating Loss Carryforwards [Line Items]
Other Tax Expense		61			61
2018 DMD [Member] | Successor [Member]
Operating Loss Carryforwards [Line Items]
Other Tax Expense		27			27
Internal Entity Restructuring [Member] | Successor [Member]
Operating Loss Carryforwards [Line Items]
Other Tax Expense		$ 26			$ 26
2016 RTA [Member] | Predecessor [Member]
Operating Loss Carryforwards [Line Items]
Other Tax Expense	$ 29