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Regulatory Capital and Other Regulatory Matters (Common Share Repurchases) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jan. 10, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2021
Jul. 12, 2021
Mar. 31, 2021
Jan. 11, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Accelerated Share Repurchases [Line Items]                            
Cash dividends declared per common share (in dollars per share)     $ 0.25   $ 0.88 [1] $ 0.76 [1] $ 0.68 [1]              
Treasury stock, common, amount     $ 594,000,000 $ 502,000,000 $ 594,000,000 $ 1,000,000   $ 679,000,000   $ 219,000,000   $ 1,000,000 $ 0 $ 104,000,000
Treasury stock, common, shares (in shares)     12,046,000 9,641,000 12,046,000 37,000   13,055,000   5,276,000   9,000 53,000 3,838,000
Common stock, shares outstanding (in shares)     337,940,636 362,639,000 337,940,636 374,674,415 374,332,000 349,599,000   371,805,000   373,857,000 373,837,000 373,155,000
Dividends declared (in dollars per share)     $ 0.25 $ 0.19 $ 0.25 $ 0.19   $ 0.25   $ 0.19   $ 0.19 $ 0.19 $ 0.19
Common stock                            
Accelerated Share Repurchases [Line Items]                            
Stock repurchase program, authorized amount                 $ 2,000,000,000   $ 1,600,000,000      
Common stock | Forecast                            
Accelerated Share Repurchases [Line Items]                            
Cash dividends declared per common share (in dollars per share)   $ 0.30                        
Common stock | Subsequent event                            
Accelerated Share Repurchases [Line Items]                            
Stock repurchase program, authorized amount $ 2,000,000,000                          
Cash dividends declared per common share (in dollars per share) $ 0.30                          
Dividends payable, date declared Jan. 10, 2022                          
Dividends payable, date to be paid Feb. 15, 2022                          
Dividends payable, date of record Feb. 01, 2022                          
Series B Preferred Stock                            
Accelerated Share Repurchases [Line Items]                            
Gross proceeds from issuance of series preferred stock       $ 1,350,000,000                    
Series C Preferred Stock                            
Accelerated Share Repurchases [Line Items]                            
Gross proceeds from issuance of series preferred stock       $ 1,000,000,000                    
[1] Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.