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Stock Plans - Share Repurchase Program (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 96 Months Ended
Dec. 02, 2020
Jan. 31, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2018
Class of Stock [Line Items]            
Common shares repurchased     $ 1,017,000,000 $ 701,000,000    
Common Stock            
Class of Stock [Line Items]            
Stock repurchase value           $ 13,700,000,000
Common shares repurchased     $ 1,000,000,000.0      
Number of shares repurchased (in shares)     18.2      
Average cost of shares repurchased (in dollars per share)     $ 55.97      
Remaining share repurchase capacity     $ 4,700,000,000      
Common Stock | Share Repurchase Program Amended January 31, 2018            
Class of Stock [Line Items]            
Stock repurchase value   $ 19,700,000,000        
Increase in share repurchase value   $ 6,000,000,000.0        
Common Stock | Share Repurchase Program Amended December 2, 2020            
Class of Stock [Line Items]            
Stock repurchase value $ 23,700,000,000          
Increase in share repurchase value $ 4,000,000,000.0          
Common Stock | Prior to January 1, 2021            
Class of Stock [Line Items]            
Common shares repurchased         $ 18,000,000,000.0