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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, 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 (loss) |  | 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)
Beginning balance (shares) at Dec. 31, 2021 |  |  | 4,975,000 | 685,057,944 |  |  |  |
Beginning balance at Dec. 31, 2021 |  | 61,029 | $ 0 | $ 7 | 34,112 | 51,006 | 374 | (24,470)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Comprehensive income (loss) |  | (2,064) |  |  |  | 2,403 | (4,467) |
Dividends, common stock (shares) | [1] |  |  | 18,408 |  |  |  |
Dividends, common stock | [1] | (251) |  | $ 0 | 2 | (253) |  |
Dividends, preferred stock |  | (57) |  |  |  | (57) |  |
Purchases of treasury stock |  | (2,484) |  |  |  |  |  | (2,484)
Issuances of common stock and restricted stock, net of forfeitures (shares) |  |  |  | 2,517,691 |  |  |  |
Issuances of common stock and restricted stock, net of forfeitures |  | 68 |  | $ 0 | 68 |  |  |
Exercises of stock options (shares) |  |  |  | 7,809 |  |  |  |
Exercises of stock options |  | 1 |  | $ 0 | 1 |  |  |
Compensation expense for restricted stock units and stock options |  | 103 |  |  | 103 |  |  |
Ending balance (shares) at Mar. 31, 2022 |  |  | 4,975,000 | 687,601,852 |  |  |  |
Ending balance at Mar. 31, 2022 |  | $ 56,345 | $ 0 | $ 7 | $ 34,286 | $ 53,099 | $ (4,093) | $ (26,954)
[1] | We declared dividends per share on our common stock of $0.60 in the first quarter of 2022 and $0.40 in the first quarter of 2021.

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