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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 (168)       (168)        
Dividends to preferred stockholders (22)       (22)        
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 6     6   0      
Employee stock purchase plan shares purchased 4     4          
Total comprehensive income:                  
Net income 34       34        
Other comprehensive income (loss) 496           496    
Total comprehensive income 530       34   496    
Ending balance (in shares) at Mar. 31, 2020   2,000,000 427,000,000            
Ending balance at Mar. 31, 2020 21,950 $ 1,570 $ 6 18,901 6,011 (4,623) 85    
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 (167)       (167)        
Dividends to preferred stockholders $ (23)       (23)        
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 0         0      
Employee stock purchase plan shares purchased 5     5          
Total comprehensive income:                  
Net income 611       611        
Other comprehensive income (loss) (351)           (351)    
Total comprehensive income 260       611   (351)    
Ending balance (in shares) at Mar. 31, 2021   2,000,000 426,000,000            
Ending balance at Mar. 31, 2021 $ 22,653 $ 1,965 $ 6 $ 18,945 $ 6,866 $ (4,718) $ (411)