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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 1,795 $ 1,401 $ 1,228
Other comprehensive income (loss), net of reclassification adjustments:      
Foreign currency translation 43 (15) (37)
Unrealized (losses) gains on investments, net (7) 11 (16)
Tax benefit (expense) on unrealized gains/losses on investments, net 1 (1) 3
Change in unrealized gains/losses on hedging activities, net (242) 74 (69)
Tax benefit (expense) on unrealized gains/losses on hedging activities, net 4 (1) 0
Other comprehensive (loss) income, net of tax (201) 68 (119)
Comprehensive income $ 1,594 $ 1,469 $ 1,109