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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Changes in Accumulated Other Comprehensive Income/(Loss)        
Total period activity $ 76 $ 145 $ (46) $ 256
Derivative Instruments        
Changes in Accumulated Other Comprehensive Income/(Loss)        
Balance at beginning of period     (223) (228)
Reclassification adjustments     6 19
Unrealized gain (loss) on hedges     60 (15)
Total period activity     66 4
Balance at end of period (157) (224) (157) (224)
Translation Adjustments        
Changes in Accumulated Other Comprehensive Income/(Loss)        
Balance at beginning of period     (548) (782)
Currency translation adjustments     (112) 252
Total period activity     (112) 252
Balance at end of period (660) (530) (660) (530)
Other        
Changes in Accumulated Other Comprehensive Income/(Loss)        
Balance at beginning of period     1 1
Balance at end of period 1 1 1 1
Total        
Changes in Accumulated Other Comprehensive Income/(Loss)        
Balance at beginning of period     (770) (1,009)
Reclassification adjustments     6 19
Unrealized gain (loss) on hedges     60 (15)
Currency translation adjustments     (112) 252
Total period activity     (46) 256
Balance at end of period $ (816) $ (753) $ (816) $ (753)