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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Preferred Stock
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance (shares) at Dec. 31, 2018   4,475,000 667,969,069        
Beginning balance at Dec. 31, 2018 $ 51,668 $ 0 $ 7 $ 32,040 $ 35,875 $ (1,263) $ (14,991)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Comprehensive income 2,015       1,412 603  
Dividends, common stock (shares)     32,700        
Dividends, common stock (191)   $ 0 3 (194)    
Dividends, preferred stock (52)       (52)    
Purchases of treasury stock (65)           (65)
Issuances of common stock and restricted stock, net of forfeitures (shares)     2,641,635        
Issuances of common stock and restricted stock, net of forfeitures 52   $ 0 52      
Exercises of stock options (shares)     5,000        
Exercises of stock options 0   $ 0 0      
Compensation expense for restricted stock units and stock options 65     65      
Ending balance (shares) at Mar. 31, 2019   4,475,000 670,648,404        
Ending balance at Mar. 31, 2019 53,481 $ 0 $ 7 32,160 37,030 (660) (15,056)
Beginning balance (shares) at Dec. 31, 2019   4,975,000 672,969,391        
Beginning balance at Dec. 31, 2019 58,011 $ 0 $ 7 32,980 40,340 1,156 (16,472)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Comprehensive income 1,191       (1,340) 2,531  
Dividends, common stock (shares)     23,213        
Dividends, common stock (185)   $ 0 2 (187)    
Dividends, preferred stock (55)       (55)    
Purchases of treasury stock (386)           (386)
Issuances of common stock and restricted stock, net of forfeitures (shares)     2,618,628        
Issuances of common stock and restricted stock, net of forfeitures 63   $ 0 63      
Exercises of stock options (shares)     559,333        
Exercises of stock options 20   $ 0 20      
Issuances of preferred stock (shares)   1,250,000          
Issuances of preferred stock 1,209 $ 0   1,209      
Redemptions of preferred stock (shares)   (875,000)          
Redemptions of preferred stock (875) $ 0   (853) (22)    
Compensation expense for restricted stock units and stock options 29     29      
Ending balance (shares) at Mar. 31, 2020   5,350,000 676,170,565        
Ending balance at Mar. 31, 2020 $ 56,830 $ 0 $ 7 $ 33,450 $ 36,552 $ 3,679 $ (16,858)