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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, 2018 |  | 4,475,000 | 667,969,069 |  |  |  |
Beginning 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 | 2,015 |  |  |  | 1,412 | 603 |
Dividends, common stock (shares) |  |  | 32,700 |  |  |  |
Dividends, common stock | (191) |  | $ 0 | 3 | (194) |  |
Dividends, preferred stock | (52) |  |  |  | (52) |  |
Purchases of treasury stock | (65) |  |  |  |  |  | (65)
Issuances of common stock and restricted stock, net of forfeitures (shares) |  |  | 2,641,635 |  |  |  |
Issuances of common stock and restricted stock, net of forfeitures | 52 |  | $ 0 | 52 |  |  |
Exercises of stock options (shares) |  |  | 5,000 |  |  |  |
Exercises of stock options | 0 |  | $ 0 | 0 |  |  |
Compensation expense for restricted stock units and stock options | 65 |  |  | 65 |  |  |
Ending balance (shares) at Mar. 31, 2019 |  | 4,475,000 | 670,648,404 |  |  |  |
Ending balance at Mar. 31, 2019 | 53,481 | $ 0 | $ 7 | 32,160 | 37,030 | (660) | (15,056)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Comprehensive income | 1,191 |  |  |  | (1,340) | 2,531 |
Dividends, common stock (shares) |  |  | 23,213 |  |  |  |
Dividends, common stock | (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)

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