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Condensed Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent
Retained Earnings [Member]
Noncontrolling Interest [Member]
Net income attributable to Gilead $ 1,975       $ 1,975  
Beginning period (in shares) at Dec. 31, 2018   1,282        
Beginning Balance at Dec. 31, 2018 21,534 $ 1 $ 2,282 $ 80 19,024 $ 147
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 1,968          
Net loss attributable to noncontrolling interest (7)         (7)
Other comprehensive income, net of tax 50     50    
Issuances under employee stock purchase plan, Shares   1        
Issuances under employee stock purchase plan 63   63      
Issuance under equity incentive plans, Shares   4        
Issuances under equity incentive plans 41   41      
Stock-based compensation 144   144      
Repurchases of common stock, shares   (13)        
Repurchases of common stock (903)   (36)   (867)  
Dividends declared (814)       (814)  
Ending period (in shares) at Mar. 31, 2019   1,274        
Ending Balance at Mar. 31, 2019 22,091 $ 1 2,494 130 19,326 140
Net income attributable to Gilead $ 1,551       1,551  
Beginning period (in shares) at Dec. 31, 2019 1,266 1,266        
Beginning Balance at Dec. 31, 2019 $ 22,650 $ 1 3,051 85 19,388 125
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 1,538          
Net loss attributable to noncontrolling interest (13)         (13)
Other comprehensive income, net of tax (39)     (39)    
Issuances under employee stock purchase plan, Shares   1        
Issuances under employee stock purchase plan 66   66      
Issuance under equity incentive plans, Shares   7        
Issuances under equity incentive plans 111   111      
Stock-based compensation 141   141      
Repurchases of common stock, shares   (20)        
Repurchases of common stock (1,414)   (58)   (1,356)  
Dividends declared $ (867)       (867)  
Ending period (in shares) at Mar. 31, 2020 1,254 1,254        
Ending Balance at Mar. 31, 2020 $ 22,179 $ 1 $ 3,311 $ 46 $ 18,709 $ 112