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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Changes in Accumulated Other Comprehensive Income/(Loss)        
Balance at beginning of period     $ (1,009) $ (1,081)
Reclassification adjustments     19 7
Deferred loss on cash flow hedges     (15) (178)
Currency translation adjustments     252 171
Total period activity $ 145 $ (45) 256 0
Balance at end of period (753) (1,081) (753) (1,081)
Derivative Instruments        
Changes in Accumulated Other Comprehensive Income/(Loss)        
Balance at beginning of period     (228) (203)
Reclassification adjustments     19 7
Deferred loss on cash flow hedges     (15) (178)
Total period activity     4 (171)
Balance at end of period (224) (374) (224) (374)
Translation Adjustments        
Changes in Accumulated Other Comprehensive Income/(Loss)        
Balance at beginning of period     (782) (878)
Currency translation adjustments     252 171
Total period activity     252 171
Balance at end of period (530) $ (707) (530) $ (707)
Other        
Changes in Accumulated Other Comprehensive Income/(Loss)        
Balance at beginning of period     1  
Balance at end of period $ 1   $ 1