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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 |

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