Equity Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Retained Earnings (Accumulated Deficit)	$ (839)		$ (1,005)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(32)
Other Comprehensive Income (Loss), Net of Tax	(58)	$ 78
Unfunded pension obligation, Net of Tax	(49)		(50)
Foreign currency translation adjustment, Net of Tax	(1,717)		(1,721)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,107)		(2,071)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(43)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(341)		$ (300)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	11
Total foreign currency translation adjustment, net of income tax	(1)	9
Total change in derivative fair value, net of income tax	(58)	67
Total pension adjustments, net of income tax	1	$ 2
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	(47)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	10
Total change in derivative fair value, net of income tax	(37)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1
Total pension adjustments, net of income tax	1
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	4
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Total foreign currency translation adjustment, net of income tax	4
ASC 606 Impact [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(4)
ASC 606 Impact [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)
ASC 606 Impact [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0
ASC 606 Impact [Member] | Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	$ 0