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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net income $ 1,819 $ 3,069 $ 3,358 $ 5,768
Other comprehensive income (loss):        
Net foreign currency translation gain (loss), net of tax (25) 29 (18) (47)
Available-for-sale securities:        
Net unrealized gain (loss), net of tax impact of $0, $1, $0 and $3, respectively 30 (58) (6) 126
Reclassifications to net income, net of tax impact of $0, $(8), $0 and $(8), respectively 4 (9) 4 (6)
Net change 34 (67) (2) 120
Cash flow hedges:        
Net unrealized gain (loss), net of tax impact of $1, $(2), $1 and $(9), respectively 118 (115) 57 (202)
Reclassifications to net income, net of tax impact of $0, $0, $0 and $(1), respectively 45 13 93 (29)
Net change 163 (102) 150 (231)
Other comprehensive income (loss) 172 (140) 130 (158)
Comprehensive income 1,991 2,929 3,488 5,610
Comprehensive income (loss) attributable to noncontrolling interest 2 (4) 3 (7)
Comprehensive income attributable to Gilead $ 1,989 $ 2,933 $ 3,485 $ 5,617