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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, 2016   4,475,000 653,736,607        
Beginning balance at Dec. 31, 2016 $ 47,514 $ 0 $ 7 $ 31,157 $ 29,766 $ (949) $ (12,467)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Comprehensive income (loss) 2,005       1,982 23  
Dividends, common stock (shares)     42,613        
Dividends, common stock (780)   $ 0 3 (783)    
Dividends, preferred stock (265)       (265)    
Purchases of treasury stock (240)           (240)
Issuances of common stock and restricted stock, net of forfeitures (shares)     4,057,555        
Issuances of common stock and restricted stock, net of forfeitures 164   $ 0 164      
Exercises of stock options and warrants (shares)     3,888,152        
Exercises of stock options and warrants 124   $ 0 124      
Compensation expense for restricted stock units and stock options 208     208      
Ending balance (shares) at Dec. 31, 2017   4,475,000 661,724,927        
Ending balance at Dec. 31, 2017 48,730 $ 0 $ 7 31,656 30,700 (926) (12,707)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Comprehensive income (loss) 5,879       6,015 (136)  
Dividends, common stock (shares)     35,813        
Dividends, common stock (773)   $ 0 3 (776)    
Dividends, preferred stock (265)       (265)    
Purchases of treasury stock (2,284)           (2,284)
Issuances of common stock and restricted stock, net of forfeitures (shares)     4,183,783        
Issuances of common stock and restricted stock, net of forfeitures 175   $ 0 175      
Exercises of stock options and warrants (shares)     2,024,546        
Exercises of stock options and warrants 38   $ 0 38      
Compensation expense for restricted stock units and stock options 168     168      
Ending balance (shares) at Dec. 31, 2018   4,475,000 667,969,069        
Ending 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 (loss) 7,077       5,546 1,531  
Dividends, common stock (shares)     49,963        
Dividends, common stock (753)   $ 0 4 (757)    
Dividends, preferred stock (282)       (282)    
Purchases of treasury stock (1,481)           (1,481)
Issuances of common stock and restricted stock, net of forfeitures (shares)     4,678,940        
Issuances of common stock and restricted stock, net of forfeitures 199   $ 0 199      
Exercises of stock options and warrants (shares)     271,419        
Exercises of stock options and warrants 17   $ 0 17      
Issuances of preferred stock (shares)   1,500,000          
Issuances of preferred stock 1,462 $ 0   1,462      
Redemptions of preferred stock (shares)   (1,000,000)          
Redemptions of preferred stock (1,000) $ 0   (969) (31)    
Compensation expense for restricted stock units and stock options 227     227      
Ending balance (shares) at Dec. 31, 2019   4,975,000 672,969,391        
Ending balance at Dec. 31, 2019 58,011 $ 0 $ 7 $ 32,980 $ 40,340 1,156 $ (16,472)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Effects from transfer of securities held to maturity to available for sale $ 888         $ 888