Equity Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unfunded pension obligation, Net of Tax	$ (272)		$ (272)		$ (274)
Foreign currency translation adjustment, Net of Tax	(3,063)		(3,063)		(3,256)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3,768)		(3,768)		(3,883)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			110
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(433)		(433)		$ (353)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			5
Other comprehensive income (loss), before cumulative effect of change in accounting principle			115
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			(83)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			3
Other comprehensive income (loss), before cumulative effect of change in accounting principle			(80)
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			2
Other comprehensive income (loss), before cumulative effect of change in accounting principle			2
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			193
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ (4)	$ (4)	$ (5)	$ (14)