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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]    
Net income $ 1,722 $ 1,538
Other comprehensive income (loss):    
Net foreign currency translation gain (loss), net of tax 10 (39)
Available-for-sale debt securities:    
Net unrealized loss, net of tax (2) (23)
Reclassifications to net income, net of tax 0 (11)
Net change (2) (34)
Cash flow hedges:    
Net unrealized gain, net of tax 68 57
Reclassifications to net income, net of tax 22 (23)
Net change 90 34
Other comprehensive income (loss) 98 (39)
Comprehensive income 1,820 1,499
Comprehensive loss attributable to noncontrolling interest (7) (13)
Comprehensive income attributable to Gilead $ 1,827 $ 1,512