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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 1,253 $ 2,172 $ (1,303) $ 4,196
Other comprehensive (loss) income, net:        
Net foreign currency translation gain (loss) 54 (35) 38 (3)
Available-for-sale debt securities:        
Net unrealized gain, net of tax impact of $0, $0, $0 and $0, respectively 0 4 0 10
Reclassifications to net income (loss), net of tax impact of $0, $0, $0 and $0, respectively 0 0 5 2
Net change 0 5 5 11
Cash flow hedges:        
Net unrealized (loss) gain, net of tax impact of $(9), $9, $3 and $9, respectively (61) 66 20 65
Reclassifications to net income (loss), net of tax impact of $2, $2, $2 and $6, respectively (12) (14) (17) (44)
Net change (74) 51 3 21
Other comprehensive (loss) income, net (20) 21 45 30
Comprehensive income (loss), net 1,233 2,193 (1,258) 4,226
Comprehensive loss attributable to noncontrolling interest, net 0 (8) 0 (40)
Comprehensive income (loss) attributable to Gilead, net $ 1,233 $ 2,201 $ (1,258) $ 4,265