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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Statement of Comprehensive Income [Abstract]    
Net income $ 12 $ 1,722
Other comprehensive income (loss):    
Net foreign currency translation gain, net of tax 5 10
Available-for-sale debt securities:    
Net unrealized loss, net of tax (19) (2)
Reclassifications to net income, net of tax 0 0
Net change (19) (2)
Cash flow hedges:    
Net unrealized gain, net of tax 24 68
Reclassifications to net income, net of tax (20) 22
Net change 4 90
Other comprehensive income (loss) (10) 98
Comprehensive income 2 1,820
Comprehensive loss attributable to noncontrolling interest 7 7
Comprehensive income attributable to Gilead $ 9 $ 1,827