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Regulatory Capital and Other Regulatory Matters (Common Share Repurchases) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 13, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Accelerated Share Repurchases [Line Items]              
Treasury stock, common, amount   $ 219 $ 104 $ 1 $ 1 $ 0  
Treasury stock, common, shares   5,276,000 3,838,000 37,000 9,000 53,000  
Common stock, shares outstanding   371,804,633 373,155,000 374,674,415 373,857,000 373,837,000 374,332,000
Dividends declared, amount per common share   $ 0.19 $ 0.19 $ 0.19 $ 0.19 $ 0.19  
Cash dividends declared per common share   $ 0.19 $ 0.19        
Common stock              
Accelerated Share Repurchases [Line Items]              
Stock repurchase program, authorized amount   $ 1,600          
Common stock | Subsequent event              
Accelerated Share Repurchases [Line Items]              
Dividends Payable, Date Declared Apr. 13, 2021            
Cash dividends declared per common share $ 0.19            
Dividends Payable, Date to be Paid May 14, 2021            
Dividends Payable, Date of Record Apr. 30, 2021