Equity Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Retained Earnings (Accumulated Deficit)	$ (824)		$ (824)		$ (1,005)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			(72)
Other Comprehensive Income (Loss), Net of Tax	(60)	$ (126)	(118)	$ (48)
Unfunded pension obligation, Net of Tax	(21)		(21)		(50)
Foreign currency translation adjustment, Net of Tax	(1,690)		(1,690)		(1,721)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,147)		(2,147)		(2,071)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(140)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(436)		(436)		$ (300)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			68
Total foreign currency translation adjustment, net of income tax	32	(124)	31	(115)
Total change in derivative fair value, net of income tax	(120)	(4)	(178)	63
Total pension adjustments, net of income tax	$ 28	$ 2	29	$ 4
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(150)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			18
Total change in derivative fair value, net of income tax			(132)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			2
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			27
Total pension adjustments, net of income tax			29
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			8
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			23
Total foreign currency translation adjustment, net of income tax			31
Accounting Standards Update 2017-12 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(4)
Accounting Standards Update 2017-12 [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(4)
Accounting Standards Update 2017-12 [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			0
Accounting Standards Update 2017-12 [Member] | Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			$ 0