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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Preferred Stock
Common Stock
Additional Paid-in Capital
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Treasury Stock, at Cost
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Dec. 31, 2017     0 491,000,000            
Beginning balance at Dec. 31, 2017 $ 20,270   $ 247 $ 6 $ 18,781 $ 4,164   $ (2,108) $ (820)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Dividends to common stockholders (471)         (471)        
Dividends to preferred stockholders (29)         (29)        
Preferred stock issued (in shares)     1,000,000              
Preferred stock issued 593   $ 593              
Treasury stock purchased (in shares)       (26,000,000)            
Treasury stock purchased (1,025)             (1,025)    
Share-based compensation plans (in shares)       1,000,000            
Share-based compensation plans 20       20          
Employee stock purchase plan shares purchased 14       14          
Total comprehensive income:                    
Net income 1,721         1,721        
Other comprehensive income (loss) (276)               (276)  
Total comprehensive income 1,445         1,721     (276)  
Ending balance (in shares) at Dec. 31, 2018     1,000,000 466,000,000            
Ending balance at Dec. 31, 2018 20,817   $ 840 $ 6 18,815 5,385   (3,133) (1,096) $ 5
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Dividends to common stockholders (617)         (617)        
Dividends to preferred stockholders (73)         (73)        
Preferred stock issued (in shares)     1,000,000              
Preferred stock issued $ 730   $ 730              
Treasury stock purchased (in shares) (34,305,768)     (34,000,000)            
Treasury stock purchased $ (1,220)             (1,220)    
Share-based compensation plans (in shares)       1,000,000            
Share-based compensation plans 59       59          
Employee stock purchase plan shares purchased 17       17          
Total comprehensive income:                    
Net income 1,791         1,791        
Other comprehensive income (loss) 680               680  
Total comprehensive income 2,471         1,791     680  
Ending balance (in shares) at Dec. 31, 2019     2,000,000 433,000,000            
Ending balance at Dec. 31, 2019 22,201 $ 17 $ 1,570 $ 6 18,891 6,498 $ 12 (4,353) (411) 5
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Dividends to common stockholders (672)         (672)        
Dividends to preferred stockholders (107)         (107)        
Preferred stock issued (in shares)     0              
Preferred stock issued $ 395   $ 395              
Treasury stock purchased (in shares) (7,548,655)     (8,000,000)            
Treasury stock purchased $ (270)             (270)    
Share-based compensation plans (in shares)       1,000,000            
Share-based compensation plans 30       30     0    
Employee stock purchase plan shares purchased 19       19          
Total comprehensive income:                    
Net income 1,057         1,057        
Other comprehensive income (loss) 351               351  
Total comprehensive income 1,408         1,057     351  
Ending balance (in shares) at Dec. 31, 2020     2,000,000 427,000,000            
Ending balance at Dec. 31, 2020 $ 22,673 $ (331) $ 1,965 $ 6 $ 18,940 $ 6,445 $ (331) $ (4,623) $ (60) $ 0