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Stock Plans - Share Repurchase Program (Details) - USD ($)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 72 Months Ended
Jan. 31, 2018
Apr. 30, 2019
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2013
Class of Stock [Line Items]            
Common shares repurchased     $ 665,000,000 $ 500,000,000    
Repurchase of common stock     646,000,000 $ 527,000,000    
Common Stock | Prior to January 1, 2018            
Class of Stock [Line Items]            
Stock repurchase value           $ 13,700,000,000
Common shares repurchased         $ 15,000,000,000.0  
Common Stock | Share Repurchase Program Amended January 1, 2018            
Class of Stock [Line Items]            
Stock repurchase value $ 19,700,000,000          
Increase in share repurchase value $ 6,000,000,000.0          
Stock repurchase expiration date Dec. 31, 2020          
Common shares repurchased     $ 700,000,000      
Number of shares repurchased (in shares)     15      
Average cost of shares repurchased (in dollars per share)     $ 44.21      
Remaining share repurchase capacity     $ 4,000,000,000.0      
Common Stock | Share Repurchase Program Amended January 1, 2018 | Subsequent Event            
Class of Stock [Line Items]            
Repurchase of common stock   $ 20,000,000