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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement of Comprehensive Income [Abstract]      
Net income $ 4,566 $ 6,201 $ 89
Other comprehensive income (loss):      
Net foreign currency translation loss (11) (38) (2)
Available-for-sale debt securities:      
Net unrealized gain (loss), net of tax impact of $0, $(1) and $12, respectively (30) (6) 43
Reclassifications to net income, net of tax impact of $0, $0 and $12, respectively 1 0 (42)
Net change (29) (6) 1
Cash flow hedges:      
Net unrealized gain (loss), net of tax impact of $20, $18 and $(15), respectively 130 129 (103)
Reclassifications to net income, net of tax impact of $25, $(9) and $6, respectively (171) 58 (41)
Net change (41) 187 (144)
Other comprehensive income (loss) (81) 143 (145)
Comprehensive income (loss) 4,485 6,344 (56)
Comprehensive loss attributable to noncontrolling interest 26 24 34
Comprehensive income (loss) attributable to Gilead $ 4,511 $ 6,368 $ (22)