Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Successor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	$ (132)
Foreign Currency Transaction Gain (Loss) Tax	74
Foreign Currency Transaction Gain (Loss) After Tax	(58)
Predecessor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax		$ (59)
Foreign Currency Transaction Gain (Loss) Tax		66
Foreign Currency Transaction Gain (Loss) After Tax		7
Subsidiary Monetary Position | Successor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	49
Foreign Currency Transaction Gain (Loss) Tax	32
Foreign Currency Transaction Gain (Loss) After Tax	81
Subsidiary Monetary Position | Predecessor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax		26
Foreign Currency Transaction Gain (Loss) Tax		36
Foreign Currency Transaction Gain (Loss) After Tax		62
Hedging Program [Member] | Successor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	(181)
Foreign Currency Transaction Gain (Loss) Tax	42
Foreign Currency Transaction Gain (Loss) After Tax	(139)
Hedging Program [Member] | Predecessor [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax		(85)
Foreign Currency Transaction Gain (Loss) Tax		30
Foreign Currency Transaction Gain (Loss) After Tax		$ (55)
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)