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Consolidated Statements of Changes in Equity - USD ($) $ in Millions | Total | Series D Preferred Stock | Series E Preferred Stock | Series F Preferred Stock | Series G Preferred Stock | Preferred Stock | Common Stock | Capital Surplus | Retained Earnings | Retained Earnings Series D Preferred Stock | Retained Earnings Series E Preferred Stock | Retained Earnings Series F Preferred Stock | Retained Earnings Series G Preferred Stock | Treasury Stock, at Cost | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interests | Cumulative Effect, Period of Adoption, Adjustment Retained Earnings | [1]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  | $ 1,900 | $ 1,257 | $ 6,295 | $ 12,469 |  |  |  |  | $ (4,909) | $ 26 | $ 0 | $ (230)
Beginning Balance, Preferred Shares (in shares) at Dec. 31, 2019 |  |  |  |  |  | 1,396,000 |  |  |  |  |  |  |  |  |  |  |
Beginning Balance, Common Shares (in shares) at Dec. 31, 2019 |  |  |  |  |  |  | 977,189,000 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  | $ 1,900 | $ 1,257 | 6,222 | 12,174 |  |  |  |  | (4,956) | 814 | 0 |
Net income (loss) | $ 146 |  |  |  |  |  |  |  | 146 |  |  |  |  |  |  | 0 |
Other comprehensive income (loss): | 788 |  |  |  |  |  |  |  |  |  |  |  |  |  | 788 |  |
Deferred compensation |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |
Cash dividends declared on common shares |  |  |  |  |  |  |  |  | (181) |  |  |  |  |  |  |  |
Cash dividends declared on preferred stock |  |  |  |  |  |  |  |  |  | $ (7) | $ (8) | $ (6) | $ (6) |  |  |  |
Open market Common Share repurchases (in shares) |  |  |  |  |  |  | (6,067,000) |  |  |  |  |  |  |  |  |  |
Open market Common Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  | (117) |  |  |
Employee equity compensation program Common Share repurchases (in shares) |  |  |  |  |  |  | (1,795,000) |  |  |  |  |  |  |  |  |  |
Employee equity compensation program Common Share repurchases |  |  |  |  |  |  |  | (72) |  |  |  |  |  | (35) |  |  |
Common shares reissued (returned) for stock options and other employee benefit plans (in shares) |  |  |  |  |  |  | 5,992,000 |  |  |  |  |  |  |  |  |  |
Common shares reissued (returned) for stock options and other employee benefit plans |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 105 |  |  |
Net contribution from (distribution to) noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Other |  |  |  |  |  |  |  |  | (3) |  |  |  |  |  |  |  |
Ending Balance, Preferred Shares (in shares) at Mar. 31, 2020 |  |  |  |  |  | 1,396,000 |  |  |  |  |  |  |  |  |  |  |
Ending Balance, Common Shares (in shares) at Mar. 31, 2020 |  |  |  |  |  |  | 975,319,000 |  |  |  |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2020 |  |  |  |  |  | $ 1,900 | $ 1,257 | 6,222 | 12,174 |  |  |  |  | (4,956) | 814 | 0 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  | 1,900 | 1,257 | 6,222 | 12,174 |  |  |  |  | (4,956) | 814 | 0 |
Beginning Balance | 17,981 |  |  |  |  | $ 1,900 | $ 1,257 | 6,281 | 12,751 |  |  |  |  | (4,946) | 738 | 0 |
Beginning Balance, Preferred Shares (in shares) at Dec. 31, 2020 |  |  |  |  |  | 1,396,000 |  |  |  |  |  |  |  |  |  |  |
Beginning Balance, Common Shares (in shares) at Dec. 31, 2020 |  |  |  |  |  |  | 975,773,000 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | 17,634 |  |  |  |  | $ 1,900 | $ 1,257 | 6,213 | 13,166 |  |  |  |  | (5,005) | 103 | 0 |
Net income (loss) | 622 |  |  |  |  |  |  |  | 622 |  |  |  |  |  |  | 0 |
Other comprehensive income (loss): | (635) |  |  |  |  |  |  |  |  |  |  |  |  |  | (635) |  |
Deferred compensation |  |  |  |  |  |  |  | (3) | (180) |  |  |  |  |  |  |  |
Cash dividends declared on common shares |  |  |  |  |  |  |  |  | (7) |  |  |  |  |  |  |  |
Cash dividends declared on preferred stock |  |  |  |  |  |  |  |  |  | $ (8) | $ (6) | $ (6) |  |  |  |  |
Open market Common Share repurchases (in shares) |  |  |  |  |  |  | (7,701,000) |  |  |  |  |  |  |  |  |  |
Open market Common Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  | (135) |  |  |
Employee equity compensation program Common Share repurchases (in shares) |  |  |  |  |  |  | (1,576,000) |  |  |  |  |  |  |  |  |  |
Employee equity compensation program Common Share repurchases |  |  |  |  |  |  |  | 0 |  |  |  |  |  | (31) |  |  |
Common shares reissued (returned) for stock options and other employee benefit plans (in shares) |  |  |  |  |  |  | 6,091,000 |  |  |  |  |  |  |  |  |  |
Common shares reissued (returned) for stock options and other employee benefit plans |  |  |  |  |  |  |  | (65) |  |  |  |  |  | 107 |  |  |
Net contribution from (distribution to) noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Other |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Ending Balance, Preferred Shares (in shares) at Mar. 31, 2021 |  | 21,000 | 500,000 | 425,000 | 450,000 | 1,396,000 |  |  |  |  |  |  |  |  |  |  |
Ending Balance, Common Shares (in shares) at Mar. 31, 2021 |  |  |  |  |  |  | 972,587,000 |  |  |  |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2021 | 17,634 |  |  |  |  | $ 1,900 | $ 1,257 | 6,213 | 13,166 |  |  |  |  | (5,005) | 103 | 0 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | $ 17,634 |  |  |  |  | $ 1,900 | $ 1,257 | $ 6,213 | $ 13,166 |  |  |  |  | $ (5,005) | $ 103 | $ 0 |
[1] | Includes the impact of implementing ASU 2016-13, Financial Instruments - Credit Losses (ASC 326): Measurement of Credit Losses on Financial Instruments. See Note 1 (“Summary of Significant Accounting Policies) in our 2020 Form 10-K for more information on our adoption of this guidance and the impact to our results of operations.

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