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Subsequent Events (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Nov. 01, 2022
USD ($)
$ / shares
shares
Oct. 28, 2022
USD ($)
Sep. 30, 2022
$ / shares
Sep. 30, 2021
$ / shares
Sep. 30, 2022
$ / shares
Sep. 30, 2021
$ / shares
Series P Preferred Stock            
Subsequent Event [Line Items]            
Cash dividends declared, Preferred, per share (in dollars per share) | $ / shares     $ 1,368 $ 1,531 $ 4,431 $ 4,594
Subsequent Event            
Subsequent Event [Line Items]            
Depository shares redeemed (in shares) | shares 60.0          
Subsequent Event | Senior debt | 2025 Senior Notes            
Subsequent Event [Line Items]            
Debt instrument, face amount | $   $ 1,000        
Interest rate   5.671%        
Subsequent Event | Senior debt | 2025 Senior Notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate            
Subsequent Event [Line Items]            
Debt instrument, basis spread on variable rate   1.09%        
Subsequent Event | Senior debt | 2033 Senior Notes            
Subsequent Event [Line Items]            
Debt instrument, face amount | $   $ 1,500        
Interest rate   6.037%        
Subsequent Event | Senior debt | 2033 Senior Notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate            
Subsequent Event [Line Items]            
Debt instrument, basis spread on variable rate   2.14%        
Subsequent Event | Series P Preferred Stock            
Subsequent Event [Line Items]            
Depository shares | $ $ 1,500          
Preferred stock, redemption price per share (in dollars per share) | $ / shares $ 25.00          
Cash dividends declared, Preferred, per share (in dollars per share) | $ / shares $ 0.43763          
Interest in preferred stock 0.00025