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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Millions
Total
Preferred Stock
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock, at Cost
Accumulated Other Comprehensive Income (Loss)
Cumulative Effect, Period of Adoption, Adjustment
Cumulative Effect, Period of Adoption, Adjustment
Retained Earnings
Beginning balance (in shares) at Dec. 31, 2019   2,000,000 433,000,000            
Beginning balance at Dec. 31, 2019 $ 22,201 $ 1,570 $ 6 $ 18,891 $ 6,498 $ (4,353) $ (411) $ (331) $ (331)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Dividends to common stockholders (504)       (504)        
Dividends to preferred stockholders (75)       (75)        
Preferred stock issued 395 $ 395              
Treasury stock purchased (in shares)     (7,000,000)            
Treasury stock purchased (270)         (270)      
Share-based compensation plans (in shares)     1,000,000            
Share-based compensation plans 17     17   0      
Employee stock purchase plan 14     14          
Total comprehensive income:                  
Net income 601       601        
Other comprehensive income (loss) 421           421    
Total comprehensive income (loss) 1,022       601   421    
Ending balance (in shares) at Sep. 30, 2020   2,000,000 427,000,000            
Ending balance at Sep. 30, 2020 22,469 $ 1,965 $ 6 18,922 6,189 (4,623) 10    
Beginning balance (in shares) at Jun. 30, 2020   2,000,000 427,000,000            
Beginning balance at Jun. 30, 2020 22,418 $ 1,965 $ 6 18,908 6,068 (4,623) 94    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Dividends to common stockholders (168)       (168)        
Dividends to preferred stockholders (25)       (25)        
Share-based compensation plans 10     10          
Employee stock purchase plan 4     4          
Total comprehensive income:                  
Net income 314       314        
Other comprehensive income (loss) (84)           (84)    
Total comprehensive income (loss) 230       314   (84)    
Ending balance (in shares) at Sep. 30, 2020   2,000,000 427,000,000            
Ending balance at Sep. 30, 2020 22,469 $ 1,965 $ 6 18,922 6,189 (4,623) 10    
Beginning balance (in shares) at Dec. 31, 2020   2,000,000 427,000,000            
Beginning balance at Dec. 31, 2020 22,673 $ 1,965 $ 6 18,940 6,445 (4,623) (60)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Dividends to common stockholders (502)       (502)        
Dividends to preferred stockholders (81)       (81)        
Preferred stock issued 296 296              
Preferred stock redemption $ (250) $ (247)     (3)        
Treasury stock purchased (in shares) (2,244,924)   (2,000,000)            
Treasury stock purchased $ (95)         (95)      
Share-based compensation plans (in shares)     1,000,000            
Share-based compensation plans 24     24          
Employee stock purchase plan 17     17          
Total comprehensive income:                  
Net income 1,789       1,789        
Other comprehensive income (loss) (448)           (448)    
Total comprehensive income (loss) 1,341       1,789   (448)    
Ending balance (in shares) at Sep. 30, 2021   2,000,000 426,000,000            
Ending balance at Sep. 30, 2021 23,423 $ 2,014 $ 6 18,981 7,648 (4,718) (508)    
Beginning balance (in shares) at Jun. 30, 2021   2,000,000 426,000,000            
Beginning balance at Jun. 30, 2021 23,199 $ 2,014 $ 6 18,964 7,314 (4,718) (381)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Dividends to common stockholders (167)       (167)        
Dividends to preferred stockholders (26)       (26)        
Preferred stock redemption (3)       (3)        
Share-based compensation plans 11     11          
Employee stock purchase plan 6     6          
Total comprehensive income:                  
Net income 530       530        
Other comprehensive income (loss) (127)           (127)    
Total comprehensive income (loss) 403       530   (127)    
Ending balance (in shares) at Sep. 30, 2021   2,000,000 426,000,000            
Ending balance at Sep. 30, 2021 $ 23,423 $ 2,014 $ 6 $ 18,981 $ 7,648 $ (4,718) $ (508)