Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Sep. 30, 2017	Aug. 31, 2017	Sep. 30, 2018		Aug. 31, 2017	Sep. 30, 2018
Successor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	$ 77		$ (77)			$ (186)
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit	(71)		26			51
Foreign Currency Transaction Gain (Loss) After Tax	6		(51)			(135)
Predecessor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax		$ (195)			$ (394)
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit		182			372
Foreign Currency Transaction Gain (Loss) After Tax		(13)			(22)
Subsidiary Monetary Position | Successor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	(35)		(108)	[1]		(213)	[1]
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit	(31)		33			57
Foreign Currency Transaction Gain (Loss) After Tax	(66)		(75)			(156)
Subsidiary Monetary Position | Predecessor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax		65			37
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit		88			217
Foreign Currency Transaction Gain (Loss) After Tax		153			254
Hedging Program [Member] | Successor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	112		31			27	[2]
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit	(40)		(7)			(6)
Foreign Currency Transaction Gain (Loss) After Tax	$ 72		24			21
Hedging Program [Member] | Predecessor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax		(260)			(431)
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit		94			155
Foreign Currency Transaction Gain (Loss) After Tax		$ (166)			$ (276)
Brazil Valuation Allowance [Member] | Hedging Program [Member] | Successor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax			$ 44
Tax Reform Foreign Currency Exchange Impact [Member] | Hedging Program [Member] | Successor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax						50
Argentina, Pesos | Hedging Program [Member] | Successor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax						$ 80

[1] Includes a net $44 million and $80 million pre-tax exchange loss associated with the devaluation of the Argentine peso for the three and nine months ended September 30, 2018, respectively.

[2] Includes a $50 million foreign exchange loss for the nine months ended September 30, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform.