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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 | Cumulative effects from adoption of new accounting standards | Cumulative effects from adoption of new accounting standards Retained Earnings | Cumulative effects from adoption of new accounting standards Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (shares) at Dec. 31, 2017 |  |  | 4,475,000 | 661,724,927 |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 |  | $ 48,730 | $ 0 | $ 7 | $ 31,656 | $ 30,700 | $ (926) | $ (12,707) | $ 0 | $ 201 | $ (201)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Comprehensive income |  | 5,879 |  |  |  | 6,015 | (136) |  |  |  |
Dividends, common stock (shares) | [1] |  |  | 35,813 |  |  |  |  |  |  |
Dividends, common stock | [1] | (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 (shares) |  |  |  | 2,024,546 |  |  |  |  |  |  |
Exercises of stock options |  | 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) | (11) | (11) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Comprehensive income |  | 7,077 |  |  |  | 5,546 | 1,531 |  |  |  |
Dividends, common stock (shares) | [1] |  |  | 49,963 |  |  |  |  |  |  |
Dividends, common stock | [1] | (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 (shares) |  |  |  | 271,419 |  |  |  |  |  |  |
Exercises of stock options |  | 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) | $ (2,192) | $ (2,184) | $ (8)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Effects from transfer of securities held to maturity to available for sale |  | 888 |  |  |  |  | 888 |  |  |  |
Comprehensive income |  | 5,060 |  |  |  | 2,714 | 2,346 |  |  |  |
Dividends, common stock (shares) | [1] |  |  | 32,466 |  |  |  |  |  |  |
Dividends, common stock | [1] | (460) |  | $ 0 | 3 | (463) |  |  |  |  |
Dividends, preferred stock |  | (280) |  |  |  | (280) |  |  |  |  |
Purchases of treasury stock |  | (393) |  |  |  |  |  | (393) |  |  |
Issuances of common stock and restricted stock, net of forfeitures (shares) |  |  |  | 5,539,010 |  |  |  |  |  |  |
Issuances of common stock and restricted stock, net of forfeitures |  | 241 |  | $ 0 | 241 |  |  |  |  |  |
Exercises of stock options (shares) |  |  |  | 1,391,970 |  |  |  |  |  |  |
Exercises of stock options |  | 62 |  | $ 0 | 62 |  |  |  |  |  |
Issuances of preferred stock (shares) |  |  | 1,375,000 |  |  |  |  |  |  |  |
Issuances of preferred stock |  | 1,330 | $ 0 |  | 1,330 |  |  |  |  |  |
Redemptions of preferred stock (shares) |  |  | (1,375,000) |  |  |  |  |  |  |  |
Redemptions of preferred stock |  | (1,375) | $ 0 |  | (1,336) | (39) |  |  |  |  |
Compensation expense for restricted stock units and stock options |  | 200 |  |  | 200 |  |  |  |  |  |
Ending balance (shares) at Dec. 31, 2020 |  |  | 4,975,000 | 679,932,837 |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 |  | $ 60,204 | $ 0 | $ 7 | $ 33,480 | $ 40,088 | $ 3,494 | $ (16,865) |  |  |
[1] | We declared dividends per share on our common stock of $0.40 in both of the first two quarters and $0.10 in both of the latter two quarters of 2020 and $0.40 in each quarter of 2019 and 2018.

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