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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, 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) | $ (2,192) | $ (2,184) | $ (8)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Comprehensive income |  | 1,191 |  |  |  | (1,340) | 2,531 |  |  |  |
Dividends, common stock (shares) | [1] |  |  | 23,213 |  |  |  |  |  |  |
Dividends, common stock | [1] | (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) |  |  |
Beginning balance (shares) at Dec. 31, 2020 |  |  | 4,975,000 | 679,932,837 |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2020 |  | 60,204 | $ 0 | $ 7 | 33,480 | 40,088 | 3,494 | (16,865) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Comprehensive income |  | 1,614 |  |  |  | 3,325 | (1,711) |  |  |  |
Dividends, common stock (shares) | [1] |  |  | 13,356 |  |  |  |  |  |  |
Dividends, common stock | [1] | (184) |  | $ 0 | 1 | (185) |  |  |  |  |
Dividends, preferred stock |  | (61) |  |  |  | (61) |  |  |  |  |
Purchases of treasury stock |  | (575) |  |  |  |  |  | (575) |  |  |
Issuances of common stock and restricted stock, net of forfeitures (shares) |  |  |  | 2,531,966 |  |  |  |  |  |  |
Issuances of common stock and restricted stock, net of forfeitures |  | 60 |  | $ 0 | 60 |  |  |  |  |  |
Exercises of stock options (shares) |  |  |  | 283,398 |  |  |  |  |  |  |
Exercises of stock options |  | 19 |  | $ 0 | 19 |  |  |  |  |  |
Compensation expense for restricted stock units and stock options |  | 111 |  |  | 111 |  |  |  |  |  |
Ending balance (shares) at Mar. 31, 2021 |  |  | 4,975,000 | 682,761,557 |  |  |  |  |  |  |
Ending balance at Mar. 31, 2021 |  | $ 61,188 | $ 0 | $ 7 | $ 33,671 | $ 43,167 | $ 1,783 | $ (17,440) |  |  |
[1] | We declared dividends per share on our common stock of 0.40 in both the first quarters of 2021 and 2020.

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