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Stock Repurchase Programs (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Equity, Class of Treasury Stock [Line Items]    
Common stock repurchased (in shares) 5  
Cash paid for shares repurchased $ 1,323 $ 800
Average cost per share (in dollars per share) $ 249.26  
July 2018 Stock Repurchase Program    
Equity, Class of Treasury Stock [Line Items]    
Remaining amount authorized for future repurchase of common stock $ 7,100