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CONSOLIDATED STATEMENTS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Total period activity $ 15 $ 97 $ (260)
Derivative Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (259) (177) (223)
Reclassification adjustments 11 9 8
Unrealized gain/(loss) on hedges (10) (91) 38
Total period activity 1 (82) 46
Ending balance (258) (259) (177)
Translation Adjustments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (674) (853) (548)
Currency translation adjustments 17 179 (305)
Total period activity 17 179 (305)
Ending balance (657) (674) (853)
Other      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance     1
Other (3)   (1)
Total period activity (3)   (1)
Ending balance (3)    
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (933) (1,030) (770)
Reclassification adjustments 11 9 8
Unrealized gain/(loss) on hedges (10) (91) 38
Currency translation adjustments 17 179 (305)
Other (3)   (1)
Total period activity 15 97 (260)
Ending balance $ (918) $ (933) $ (1,030)