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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock 
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Noncontrolling Interest
Beginning period (in shares) at Dec. 31, 2017   1,308        
Beginning balance at Dec. 31, 2017 $ 20,501 $ 1 $ 1,264 $ 165 $ 19,012 $ 59
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Change in noncontrolling interest 83   0     83
Net income 5,460       5,455 5
Other comprehensive income, net of tax 208     208    
Issuances under employee stock purchase plan (in shares)   2        
Issuances under employee stock purchase plan 91   91      
Issuance under equity incentive plans (in shares)   14        
Issuances under equity incentive plans 197   197      
Stock-based compensation 842   842      
Repurchases of common stock, shares   (42)        
Repurchases of common stock (3,052)   (112)   (2,940)  
Dividends declared (2,986)       (2,986)  
Ending period (in shares) at Dec. 31, 2018   1,282        
Ending balance at Dec. 31, 2018 21,534 $ 1 2,282 80 19,024 147
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 5,364       5,386 (22)
Other comprehensive income, net of tax 5     5    
Issuances under employee stock purchase plan (in shares)   2        
Issuances under employee stock purchase plan 90   90      
Issuance under equity incentive plans (in shares)   10        
Issuances under equity incentive plans 118   118      
Stock-based compensation 638   638      
Repurchases of common stock, shares   (28)        
Repurchases of common stock (1,868)   (77)   (1,791)  
Dividends declared $ (3,239)       (3,239)  
Ending period (in shares) at Dec. 31, 2019 1,266 1,266        
Ending balance at Dec. 31, 2019 $ 22,650 $ 1 3,051 85 19,388 125
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Change in noncontrolling interest (72)         (72)
Net income 89       123 (34)
Other comprehensive income, net of tax (145)   1 (145) (1)  
Issuances under employee stock purchase plan (in shares)   2        
Issuances under employee stock purchase plan 100   100      
Issuance under equity incentive plans (in shares)   11        
Issuances under equity incentive plans 156   156      
Stock-based compensation 642   642      
Repurchases of common stock, shares   (25)        
Repurchases of common stock (1,728)   (70)   (1,658)  
Dividends declared $ (3,464)       (3,464)  
Ending period (in shares) at Dec. 31, 2020 1,254 1,254        
Ending balance at Dec. 31, 2020 $ 18,221 $ 1 $ 3,880 $ (60) $ 14,381 $ 19