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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
shares in Thousands, $ in Millions
Total
Preferred Stock, end of period
Common Stock
Additional Paid-in Capital
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Treasury Stock, at cost
Treasury Stock, at cost
Stock Compensation Plan
Warrant
Accumulated Other Comprehensive Income (Loss), net of tax
Accumulated Other Comprehensive Income (Loss), net of tax
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), net of tax
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Beginning balance at Dec. 31, 2017   $ 0   $ 4,379 $ 9,642 $ 5 $ 9,647 $ (1,194)     $ 663 $ (5) $ 658
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Issuance of shares under incentive and stock compensation plans       (110)                  
Stock-based compensation plans expense       123                  
Issuance of shares for warrant exercise       (14)                  
Net income $ 1,807       1,807                
Dividends declared on preferred stock (6)       (6)                
Dividends declared on common stock         (393)                
Treasury stock acquired               0          
Stock Issued During Period, Value, Treasury Stock Reissued                 $ 132 $ 14      
Net shares acquired related to employee incentive and stock compensation plans               (43)          
Other Comprehensive Income (Loss), Net of Tax                     (2,237)    
Ending balance at Dec. 31, 2018 $ 13,101 $ 334 $ 4 4,378 11,055 0 11,055 (1,091)     (1,579) 0  
Preferred Shares Outstanding, beginning of period at Dec. 31, 2017   0                      
Preferred Shares Outstanding                          
Issuance of preferred shares   13,800                      
Preferred Shares Outstanding, end of period at Dec. 31, 2018   13,800                      
Common Shares Outstanding, beginning of period (in thousands) at Dec. 31, 2017     356,835                    
Common Shares Outstanding                          
Treasury stock acquired     0                    
Issuance of shares under incentive and stock compensation plans     2,856                    
Return of shares under incentive and stock compensation plans to treasury stock     (849)                    
Issuance of shares for warrant exercise     309                    
Common Shares Outstanding, end of period at Dec. 31, 2018     359,151                    
Common Shares Outstanding                          
Cash dividends declared per common share $ 1.10                        
Preferred Stock, Dividends Per Share, Declared $ 412.50                        
Issuance of preferred stock   $ 334                      
Issuance of shares under incentive and stock compensation plans       (100)                  
Stock-based compensation plans expense       114                  
Issuance of shares for warrant exercise       (80)                  
Net income $ 2,085       2,085                
Dividends declared on preferred stock (21)       (21)                
Dividends declared on common stock         (434)                
Treasury stock acquired (200)             (200)          
Stock Issued During Period, Value, Treasury Stock Reissued                 135 80      
Net shares acquired related to employee incentive and stock compensation plans               (41)          
Other Comprehensive Income (Loss), Net of Tax                     1,631    
Ending balance at Dec. 31, 2019 $ 16,270 $ 334 $ 4 4,312 12,685   $ 12,667 (1,117)     52   (1,579)
Ending balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019           $ (18)              
Preferred Shares Outstanding                          
Issuance of preferred shares   0                      
Preferred Shares Outstanding, end of period at Dec. 31, 2019   13,800                      
Common Shares Outstanding                          
Treasury stock acquired (3,400)   (3,412)                    
Issuance of shares under incentive and stock compensation plans     2,906                    
Return of shares under incentive and stock compensation plans to treasury stock     (796)                    
Issuance of shares for warrant exercise     1,721                    
Common Shares Outstanding, end of period at Dec. 31, 2019     359,570                    
Common Shares Outstanding                          
Cash dividends declared per common share $ 1.20                        
Preferred Stock, Dividends Per Share, Declared $ 1,500.00                        
Issuance of preferred stock   $ 0                      
Issuance of shares under incentive and stock compensation plans       (96)                  
Stock-based compensation plans expense       106                  
Issuance of shares for warrant exercise       0                  
Net income $ 1,737       1,737                
Dividends declared on preferred stock (21)       (21)                
Dividends declared on common stock         (465)                
Treasury stock acquired (150)             (150)          
Stock Issued During Period, Value, Treasury Stock Reissued                 $ 112 $ 0      
Net shares acquired related to employee incentive and stock compensation plans               (37)          
Other Comprehensive Income (Loss), Net of Tax                     1,118    
Ending balance at Dec. 31, 2020 $ 18,556 $ 334 $ 4 $ 4,322 $ 13,918     $ (1,192)     $ 1,170 $ 0 $ 52
Preferred Shares Outstanding                          
Issuance of preferred shares   0                      
Preferred Shares Outstanding, end of period at Dec. 31, 2020   13,800                      
Common Shares Outstanding                          
Treasury stock acquired (2,700)   (2,661)                    
Issuance of shares under incentive and stock compensation plans     2,298                    
Return of shares under incentive and stock compensation plans to treasury stock     (718)                    
Issuance of shares for warrant exercise     0                    
Common Shares Outstanding, end of period at Dec. 31, 2020     358,489                    
Common Shares Outstanding                          
Cash dividends declared per common share $ 1.30                        
Preferred Stock, Dividends Per Share, Declared $ 1,500.00                        
Issuance of preferred stock   $ 0