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Share Repurchases (Details) - USD ($)
shares in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Oct. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Class of Stock [Line Items]              
Payments for repurchase of common stock     $ 1,800,000,000 $ 6,279,100,000      
December 2019 Share Repurchase Program              
Class of Stock [Line Items]              
Stock Repurchase Program, Authorized Amount           $ 5,000,000,000  
Repurchase of common stock, at cost, shares   4.5   16.7      
Payments for repurchase of common stock   $ 1,300,000,000   $ 5,000,000,000      
2020 Share Repurchase Program              
Class of Stock [Line Items]              
Stock Repurchase Program, Authorized Amount             $ 5,000,000,000
Repurchase of common stock, at cost, shares       4.1      
Payments for repurchase of common stock       $ 1,300,000,000      
October 2020 Share Repurchase Program              
Class of Stock [Line Items]              
Stock Repurchase Program, Authorized Amount         $ 5,000,000,000    
Repurchase of common stock, at cost, shares 2.2   6.0        
Payments for repurchase of common stock $ 750,000,000   $ 1,800,000,000        
Amount remaining under 2019 Share Repurchase Program $ 2,800,000,000   $ 2,800,000,000