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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Foreign currency translation adjustments, tax $ (2) $ 10 $ 19 $ (5)
Unrealized gains (losses), tax 0 (1) 8 1
Reclassification adjustment for losses (gains) included in “Other income (expense), net,” tax $ 0 $ 0 $ 0 $ 0