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Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2023 |  | $ 21,985 | $ 136 | $ 2,771 | $ 47,993 | $ (5,520) | $ (23,395)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 1,879 | 0 | 0 | 1,879 | 0 | 0
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | (597) | 0 | 0 | 0 | (597) | 0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments |  | (47) | 0 | 0 | 0 | (47) | 0
Unrealized gains (losses) on derivatives during period, net of income taxes |  | (4) | 0 | 0 | 0 | (4) | 0
Effect of changes in discount rate assumptions during period, net of income taxes |  | 1,065 | 0 | 0 | 0 | 1,065 | 0
Pension liability adjustment during period, net of income taxes |  | 1 | 0 | 0 | 0 | 1 | 0
Dividends to shareholders | [1] | 0 | 0 | 0 | 0 | 0 | 0
Exercise of stock options |  | 4 | 0 | 4 | 0 | 0 | 0
Share-based compensation |  | 18 | 0 | 18 | 0 | 0 | 0
Purchases of treasury stock |  | (793) | 0 | 0 | 0 | 0 | (793)
Treasury stock reissued |  | 26 | 0 | 13 | 0 | 0 | 13
Balance, end of period at Mar. 31, 2024 |  | 23,537 | 136 | 2,806 | 49,872 | (5,102) | (24,175)
Balance, beginning of period at Dec. 31, 2023 |  | 21,985 | 136 | 2,771 | 47,993 | (5,520) | (23,395)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 3,541 |  |  |  |  |
Balance, end of period at Sep. 30, 2024 |  | 24,830 | 136 | 2,876 | 50,972 | (3,677) | (25,477)
Balance, beginning of period at Mar. 31, 2024 |  | 23,537 | 136 | 2,806 | 49,872 | (5,102) | (24,175)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 1,755 | 0 | 0 | 1,755 | 0 | 0
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | (425) | 0 | 0 | 0 | (425) | 0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments |  | (691) | 0 | 0 | 0 | (691) | 0
Unrealized gains (losses) on derivatives during period, net of income taxes |  | 4 | 0 | 0 | 0 | 4 | 0
Effect of changes in discount rate assumptions during period, net of income taxes |  | 2,920 | 0 | 0 | 0 | 2,920 | 0
Pension liability adjustment during period, net of income taxes |  | 2 | 0 | 0 | 0 | 2 | 0
Dividends to shareholders | [1] | (282) | 0 | 0 | (282) | 0 | 0
Exercise of stock options |  | 2 | 0 | 2 | 0 | 0 | 0
Share-based compensation |  | 12 | 0 | 12 | 0 | 0 | 0
Purchases of treasury stock |  | (810) | 0 | 0 | 0 | 0 | (810)
Treasury stock reissued |  | 23 | 0 | 15 | 0 | 0 | 8
Balance, end of period at Jun. 30, 2024 |  | 26,047 | 136 | 2,835 | 51,345 | (3,292) | (24,977)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | (93) | 0 | 0 | (93) | 0 | 0
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | 952 | 0 | 0 | 0 | 952 | 0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments |  | 156 | 0 | 0 | 0 | 156 | 0
Unrealized gains (losses) on derivatives during period, net of income taxes |  | 2 | 0 | 0 | 0 | 2 | 0
Effect of changes in discount rate assumptions during period, net of income taxes |  | (1,492) | 0 | 0 | 0 | (1,492) | 0
Pension liability adjustment during period, net of income taxes |  | (3) | 0 | 0 | 0 | (3) | 0
Dividends to shareholders | [1] | (280) | 0 | 0 | (280) | 0 | 0
Exercise of stock options |  | 1 | 0 | 1 | 0 | 0 | 0
Share-based compensation |  | 21 | 0 | 21 | 0 | 0 | 0
Purchases of treasury stock |  | (505) | 0 | 0 | 0 | 0 | (505)
Treasury stock reissued |  | 24 | 0 | 19 | 0 | 0 | 5
Balance, end of period at Sep. 30, 2024 |  | 24,830 | 136 | 2,876 | 50,972 | (3,677) | (25,477)
Balance, beginning of period at Dec. 31, 2024 |  | 26,098 | 136 | 2,894 | 52,277 | (2,978) | (26,231)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 29 | 0 | 0 | 29 | 0 | 0
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | 449 | 0 | 0 | 0 | 449 | 0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments |  | (1,257) | 0 | 0 | 0 | (1,257) | 0
Unrealized gains (losses) on derivatives during period, net of income taxes |  | 2 | 0 | 0 | 0 | 2 | 0
Effect of changes in discount rate assumptions during period, net of income taxes |  | 1,893 | 0 | 0 | 0 | 1,893 | 0
Pension liability adjustment during period, net of income taxes |  | 32 | 0 | 0 | 0 | 32 | 0
Dividends to shareholders | [1] | 2 | 0 | 0 | 2 | 0 | 0
Exercise of stock options |  | 4 | 0 | 4 | 0 | 0 | 0
Share-based compensation |  | 8 | 0 | 8 | 0 | 0 | 0
Purchases of treasury stock |  | (949) | 0 | 0 | 0 | 0 | (949)
Treasury stock reissued |  | 27 | 0 | 13 | 0 | 0 | 14
Balance, end of period at Mar. 31, 2025 |  | 26,338 | 136 | 2,919 | 52,308 | (1,859) | (27,166)
Balance, beginning of period at Dec. 31, 2024 |  | 26,098 | 136 | 2,894 | 52,277 | (2,978) | (26,231)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 2,267 |  |  |  |  |
Balance, end of period at Sep. 30, 2025 |  | 28,688 | 136 | 2,977 | 53,923 | 653 | (29,001)
Balance, beginning of period at Mar. 31, 2025 |  | 26,338 | 136 | 2,919 | 52,308 | (1,859) | (27,166)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 599 | 0 | 0 | 599 | 0 | 0
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | 267 | 0 | 0 | 0 | 267 | 0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments |  | (595) | 0 | 0 | 0 | (595) | 0
Unrealized gains (losses) on derivatives during period, net of income taxes |  | 1 | 0 | 0 | 0 | 1 | 0
Effect of changes in discount rate assumptions during period, net of income taxes |  | 1,695 | 0 | 0 | 0 | 1,695 | 0
Pension liability adjustment during period, net of income taxes |  | 0 | 0 | 0 | 0 | 0 | 0
Dividends to shareholders | [1] | (312) | 0 | 0 | (312) | 0 | 0
Exercise of stock options |  | 0 | 0 | 0 | 0 | 0 | 0
Share-based compensation |  | 30 | 0 | 30 | 0 | 0 | 0
Purchases of treasury stock |  | (839) | 0 | 0 | 0 | 0 | (839)
Treasury stock reissued |  | 16 | 0 | 9 | 0 | 0 | 7
Balance, end of period at Jun. 30, 2025 |  | 27,200 | 136 | 2,958 | 52,595 | (491) | (27,998)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 1,639 | 0 | 0 | 1,639 | 0 | 0
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | (222) | 0 | 0 | 0 | (222) | 0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments |  | 127 | 0 | 0 | 0 | 127 | 0
Unrealized gains (losses) on derivatives during period, net of income taxes |  | 1 | 0 | 0 | 0 | 1 | 0
Effect of changes in discount rate assumptions during period, net of income taxes |  | 1,238 | 0 | 0 | 0 | 1,238 | 0
Pension liability adjustment during period, net of income taxes |  | 0 | 0 | 0 | 0 | 0 | 0
Dividends to shareholders | [1] | (311) | 0 | 0 | (311) | 0 | 0
Exercise of stock options |  | 1 | 0 | 1 | 0 | 0 | 0
Share-based compensation |  | 5 | 0 | 5 | 0 | 0 | 0
Purchases of treasury stock |  | (1,009) | 0 | 0 | 0 | 0 | (1,009)
Treasury stock reissued |  | 19 | 0 | 13 | 0 | 0 | 6
Balance, end of period at Sep. 30, 2025 |  | $ 28,688 | $ 136 | $ 2,977 | $ 53,923 | $ 653 | $ (29,001)
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