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Stockholders' Equity - Stock Repurchase Program (Details)
$ / shares in Units, shares in Millions
1 Months Ended 2 Months Ended 4 Months Ended 12 Months Ended
Oct. 29, 2021
USD ($)
segment
shares
Feb. 13, 2020
USD ($)
segment
shares
Dec. 31, 2021
USD ($)
shares
Jul. 31, 2020
$ / shares
shares
Feb. 24, 2022
USD ($)
shares
Feb. 24, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 31, 2021
USD ($)
Feb. 28, 2021
USD ($)
Jan. 31, 2020
USD ($)
Jan. 31, 2019
USD ($)
Equity, Class of Treasury Stock [Line Items]                          
Authorized repurchase amount                   $ 3,000,000,000 $ 4,000,000,000 $ 5,000,000,000 $ 4,000,000,000
Number of financial institutions with ASR agreements | segment 2 3                      
Value of shares repurchased             $ 4,542,000,000            
Shares repurchased (in shares) | shares             67.0            
Unsettled forward contract for share repurchase             $ 188,000,000            
Number of shares repurchased under the ASR agreement | shares     3.4 74.0                  
Accelerated share repurchase, average price per share (in usd per share) | $ / shares       $ 40.77                  
Subsequent Event                          
Equity, Class of Treasury Stock [Line Items]                          
Authorized repurchase amount         $ 4,000,000,000 $ 4,000,000,000              
Number of shares repurchased under the ASR agreement | shares         3.3 36.0              
Accelerated share repurchase, average price per share (in usd per share) | $ / shares           $ 69.43              
Treasury Stock                          
Equity, Class of Treasury Stock [Line Items]                          
Value of shares repurchased             6,856,000,000 $ 5,119,000,000 $ 5,002,000,000        
ASR Agreement                          
Equity, Class of Treasury Stock [Line Items]                          
Value of shares repurchased $ 2,500,000,000 $ 3,000,000,000                      
Shares repurchased (in shares) | shares 29.3 69.0                      
Unsettled forward contract for share repurchase $ 187,500,000 $ 450,000,000                      
ASR Agreement | Treasury Stock                          
Equity, Class of Treasury Stock [Line Items]                          
Value of shares repurchased $ 2,125,000,000 $ 2,550,000,000 $ 187,500,000       $ 2,312,000,000            
Shares repurchased (in shares) | shares             33.0            
ASR Agreement | Treasury Stock | Subsequent Event                          
Equity, Class of Treasury Stock [Line Items]                          
Value of shares repurchased         $ 187,500,000