Equity Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			$ 130
Unfunded pension obligation, Net of Tax	$ (271)		(271)		$ (274)
Foreign currency translation adjustment, Net of Tax	(3,077)		(3,077)		(3,256)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3,753)		(3,753)		(3,883)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			108
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(405)		(405)		$ (353)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			22
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(16)	$ (513)	232	$ (857)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	19	(70)	(138)	(73)
Total pension adjustments, net of income tax	$ 3	$ 4	10	$ 13
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax			179
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			(71)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			19
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax			(52)
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			3
Total pension adjustments, net of income tax			3
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			179
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			$ 0