CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Changes in Accumulated Other Comprehensive Income/(Loss)
Balance at beginning of period	$ (1,009)	$ (1,081)
Reclassification adjustments	2	1
Deferred gain (loss) on cash flow hedges	7	(90)
Currency translation adjustments	27	207
Total period activity	36	118
Balance at end of period	(973)	(963)
Derivative Instruments
Changes in Accumulated Other Comprehensive Income/(Loss)
Balance at beginning of period	(228)	(203)
Reclassification adjustments	2	1
Deferred gain (loss) on cash flow hedges	7	(90)
Total period activity	9	(89)
Balance at end of period	(219)	(292)
Translation Adjustments
Changes in Accumulated Other Comprehensive Income/(Loss)
Balance at beginning of period	(782)	(878)
Currency translation adjustments	27	207
Total period activity	27	207
Balance at end of period	(755)	$ (671)
Other
Changes in Accumulated Other Comprehensive Income/(Loss)
Balance at beginning of period	1
Balance at end of period	$ 1