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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Balance at beginning of period $ (1,081) $ (467)
Reclassification adjustments 1 (6)
Deferred loss on cash flow hedges (90) (72)
Currency translation adjustments 207 (298)
Total period activity 118 (376)
Balance at end of period (963) (843)
Derivative Instruments    
Balance at beginning of period (203) (159)
Reclassification adjustments 1 (6)
Deferred loss on cash flow hedges (90) (72)
Total period activity (89) (78)
Balance at end of period (292) (237)
Translation Adjustments    
Balance at beginning of period (878) (308)
Currency translation adjustments 207 (298)
Total period activity 207 (298)
Balance at end of period $ (671) $ (606)