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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 2,586 $ 353 $ 5,825 $ (1,455)
Other comprehensive income (loss):        
Net foreign currency translation gain (loss), net of tax (20) 23 (15) (12)
Available-for-sale debt securities:        
Net unrealized gain (loss), net of tax 0 (9) (3) 42
Reclassifications to net income (loss), net of tax 0 (4) 0 (17)
Net change 0 (13) (3) 25
Cash flow hedges:        
Net unrealized gain (loss), net of tax 37 (46) 92 (25)
Reclassifications to net income (loss), net of tax 18 (11) 60 (50)
Net change 55 (57) 152 (75)
Other comprehensive income (loss) 35 (47) 134 (62)
Comprehensive income (loss) 2,621 306 5,959 (1,517)
Comprehensive loss attributable to noncontrolling interest 6 7 18 27
Comprehensive income (loss) attributable to Gilead $ 2,627 $ 313 $ 5,977 $ (1,490)