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Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions | Total | Non-cumulative preferred shares | Common shares | Additional paid-in capital | Retained earnings | Accumulated other comprehensive income (loss) | Unrealized Appreciation on Available-For-Sale Investments | Foreign currency translation adjustments, net of deferred income tax | Common shares held in treasury, at cost
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of year at Dec. 31, 2020 |  | $ 780 | $ 1 | $ 1,978 | $ 12,362 | $ 489 | $ 501 | $ (12) | $ (2,504)
Preferred shares issued |  | 500 |  |  |  |  |  |  |
Preferred shares redeemed |  | (450) |  |  |  |  |  |  |
Issue costs on preferred shares issued |  |  |  | (14) |  |  |  |  |
Loss on redemption of preferred shares | $ (15) |  |  | 15 | (15) |  |  |  |
Amortization of share-based compensation |  |  |  | 86 |  |  |  |  |
Other changes |  |  |  | 20 |  |  |  |  |
Net income | 2,239 |  |  |  | 2,239 |  |  |  |
Net (income) loss attributable to noncontrolling interests | (82) |  |  |  | (82) |  |  |  |
Preferred share dividends | (48) |  |  |  | (48) |  |  |  |
Unrealized holding gains (losses) during period, net of reclassification adjustment |  |  |  |  |  |  | (503) |  |
Unrealized holding gains (losses) during period attributable to noncontrolling interests |  |  |  |  |  |  | 15 |  |
Foreign currency translation adjustments | (65) |  |  |  |  |  |  | (65) |
Foreign currency translation adjustments attributable to noncontrolling interests |  |  |  |  |  |  |  | (1) |
Shares repurchased for treasury | (1,234) |  |  |  |  |  |  |  | (1,257)
Balance at end of year at Dec. 31, 2021 | 13,546 | 830 | 1 | 2,085 | 14,456 | (65) | 13 | (78) | (3,761)
Preferred shares issued |  | 0 |  |  |  |  |  |  |
Preferred shares redeemed |  | 0 |  |  |  |  |  |  |
Issue costs on preferred shares issued |  |  |  | 0 |  |  |  |  |
Loss on redemption of preferred shares | 0 |  |  | 0 | 0 |  |  |  |
Amortization of share-based compensation |  |  |  | 88 |  |  |  |  |
Other changes |  |  |  | 38 |  |  |  |  |
Net income | 1,482 |  |  |  | 1,482 |  |  |  |
Net (income) loss attributable to noncontrolling interests | (6) |  |  |  | (6) |  |  |  |
Preferred share dividends | (40) |  |  |  | (40) |  |  |  |
Unrealized holding gains (losses) during period, net of reclassification adjustment |  |  |  |  |  |  | (1,525) |  |
Unrealized holding gains (losses) during period attributable to noncontrolling interests |  |  |  |  |  |  | 0 |  |
Foreign currency translation adjustments | (56) |  |  |  |  |  |  | (56) |
Foreign currency translation adjustments attributable to noncontrolling interests |  |  |  |  |  |  |  | 0 |
Shares repurchased for treasury | (586) |  |  |  |  |  |  |  | (617)
Balance at end of year at Dec. 31, 2022 | 12,910 | 830 | 1 | 2,211 | 15,892 | (1,646) | (1,512) | (134) | (4,378)
Preferred shares issued |  | 0 |  |  |  |  |  |  |
Preferred shares redeemed |  | 0 |  |  |  |  |  |  |
Issue costs on preferred shares issued |  |  |  | 0 |  |  |  |  |
Loss on redemption of preferred shares | 0 |  |  | 0 | 0 |  |  |  |
Amortization of share-based compensation |  |  |  | 93 |  |  |  |  |
Other changes |  |  |  | 23 |  |  |  |  |
Net income | 4,442 |  |  |  | 4,442 |  |  |  |
Net (income) loss attributable to noncontrolling interests | 1 |  |  |  | 1 |  |  |  |
Preferred share dividends | (40) |  |  |  | (40) |  |  |  |
Unrealized holding gains (losses) during period, net of reclassification adjustment |  |  |  |  |  |  | 947 |  |
Unrealized holding gains (losses) during period attributable to noncontrolling interests |  |  |  |  |  |  | 0 |  |
Foreign currency translation adjustments | 23 |  |  |  |  |  |  | 23 |
Foreign currency translation adjustments attributable to noncontrolling interests |  |  |  |  |  |  |  | 0 |
Shares repurchased for treasury | 0 |  |  |  |  |  |  |  | (46)
Balance at end of year at Dec. 31, 2023 | $ 18,353 | $ 830 | $ 1 | $ 2,327 | $ 20,295 | $ (676) | $ (565) | $ (111) | $ (4,424)

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