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Consolidated Statements Of Changes In Shareholders' Equity (unaudited) - USD ($) shares in Millions, $ in Millions | Total | Nonredeemable Preferred Stock | Common Stock | Capital Surplus | Accumulated Other Comprehensive Loss | Retained Earnings | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2021 | $ 7,897 | $ 394 | $ 1,141 | $ 2,175 | $ (212) | $ 10,494 | $ (6,095)
Beginning balance (in shares) at Dec. 31, 2021 |  |  | 130.7 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 189 |  |  |  |  | 189 |
Other comprehensive income (loss), net of tax | (961) |  |  |  | (961) |  |
Cash dividends declared on common stock ($0.68 per share and $0.71 per share) | (89) |  |  |  |  | (89) |
Cash dividends declared on preferred stock | (6) |  |  |  |  | (6) |
Purchase of common stock (in shares) |  |  | (0.4) |  |  |  |
Purchase of common stock | (36) |  |  |  |  |  | (36)
Net issuance of common stock under employee stock plans (in shares) |  |  | 0.4 |  |  |  |
Net issuance of common stock under employee stock plans | 14 |  |  | (9) |  | (3) | 26
Share-based compensation | 28 |  |  | 28 |  |  |
Ending balance at Mar. 31, 2022 | 7,036 | 394 | $ 1,141 | 2,194 | (1,173) | 10,585 | (6,105)
Ending balance (in shares) at Mar. 31, 2022 |  |  | 130.7 |  |  |  |
Beginning balance at Dec. 31, 2022 | 5,181 | 394 | $ 1,141 | 2,220 | (3,742) | 11,258 | (6,090)
Beginning balance (in shares) at Dec. 31, 2022 |  |  | 131.0 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 324 |  |  |  |  | 324 |
Other comprehensive income (loss), net of tax | 571 |  |  |  | 571 |  |
Cash dividends declared on common stock ($0.68 per share and $0.71 per share) | (94) |  |  |  |  | (94) |
Cash dividends declared on preferred stock | (6) |  |  |  |  | (6) |
Net issuance of common stock under employee stock plans (in shares) |  |  | 0.5 |  |  |  |
Net issuance of common stock under employee stock plans | (10) |  |  | (39) |  | (6) | 35
Share-based compensation | 28 |  |  | 28 |  |  |
Ending balance at Mar. 31, 2023 | $ 5,994 | $ 394 | $ 1,141 | $ 2,209 | $ (3,171) | $ 11,476 | $ (6,055)
Ending balance (in shares) at Mar. 31, 2023 |  |  | 131.5 |  |  |  |

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