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Stockholders' equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning $ 9,187  
Net income (1,753) $ (1,174)
Other comprehensive income (loss), net of taxes 13 19
Balance, ending 10,166  
Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning 1,741 1,741
Balance, ending 1,741 1,741
Paid-in Capital    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning 2,333 2,110
Common stock issued for stock-based awards (3) (77)
Stock compensation 61 63
Balance, ending 2,391 2,096
Retained Earnings    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning 42,051 39,898
Net income (1,753) (1,174)
Dividends declared and paid (940) (841)
Dividend equivalents on RSUs (4) (4)
Balance, ending 42,860 40,227
Treasury Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning (36,578) (34,495)
Common stock issued for stock-based awards 199 223
Stock repurchases (100) (1,730)
Balance, ending (36,479) (36,002)
AOCI    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning (360) (347)
Other comprehensive income (loss), net of taxes 13 19
Balance, ending $ (347) $ (328)