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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, 2021 |  | $ 17,031 | $ 135 | $ 2,529 | $ 40,963 | $ (8,411) | $ (18,185)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 1,047 | 0 | 0 | 1,047 | 0 | 0
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | (453) | 0 | 0 | 0 | (453) | 0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments |  | (3,815) | 0 | 0 | 0 | (3,815) | 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 |  | 4,224 | 0 | 0 | 0 | 4,224 | 0
Pension liability adjustment during period, net of income taxes |  | 3 | 0 | 0 | 0 | 3 | 0
Dividends to shareholders | [1] | 0 | 0 | 0 | 0 | 0 | 0
Exercise of stock options |  | 6 | 0 | 6 | 0 | 0 | 0
Share-based compensation |  | 13 | 0 | 13 | 0 | 0 | 0
Purchases of treasury stock |  | (523) | 0 | 0 | 0 | 0 | (523)
Treasury stock reissued |  | 26 | 0 | 12 | 0 | 0 | 14
Balance, end of period at Mar. 31, 2022 |  | 17,560 | 135 | 2,560 | 42,010 | (8,451) | (18,694)
Balance, beginning of period at Dec. 31, 2021 |  | 17,031 | 135 | 2,529 | 40,963 | (8,411) | (18,185)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 4,222 |  |  |  |  |
Effect of changes in discount rate assumptions during period, net of income taxes |  | 11,800 |  |  |  |  |
Balance, end of period at Sep. 30, 2022 |  | 19,946 | 135 | 2,615 | 44,680 | (7,505) | (19,979)
Balance, beginning of period at Dec. 31, 2021 |  | 17,031 | 135 | 2,529 | 40,963 | (8,411) | (18,185)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Effect of changes in discount rate assumptions during period, net of income taxes |  | 13,700 |  |  |  |  |
Balance, end of period at Dec. 31, 2022 |  | 20,140 | 135 | 2,641 | 44,367 | (6,429) | (20,574)
Balance, beginning of period at Mar. 31, 2022 |  | 17,560 | 135 | 2,560 | 42,010 | (8,451) | (18,694)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 1,394 | 0 | 0 | 1,394 | 0 | 0
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | (780) | 0 | 0 | 0 | (780) | 0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments |  | (2,857) | 0 | 0 | 0 | (2,857) | 0
Unrealized gains (losses) on derivatives during period, net of income taxes |  | 0 | 0 | 0 | 0 | 0 | 0
Effect of changes in discount rate assumptions during period, net of income taxes |  | 5,105 | 0 | 0 | 0 | 5,105 | 0
Pension liability adjustment during period, net of income taxes |  | 3 | 0 | 0 | 0 | 3 | 0
Dividends to shareholders | [1] | (254) | 0 | 0 | (254) | 0 | 0
Exercise of stock options |  | 1 | 0 | 1 | 0 | 0 | 0
Share-based compensation |  | 19 | 0 | 19 | 0 | 0 | 0
Purchases of treasury stock |  | (650) | 0 | 0 | 0 | 0 | (650)
Treasury stock reissued |  | 17 | 0 | 9 | 0 | 0 | 8
Balance, end of period at Jun. 30, 2022 |  | 19,558 | 135 | 2,589 | 43,150 | (6,980) | (19,336)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 1,781 | 0 | 0 | 1,781 | 0 | 0
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | (1,156) | 0 | 0 | 0 | (1,156) | 0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments |  | (1,799) | 0 | 0 | 0 | (1,799) | 0
Unrealized gains (losses) on derivatives during period, net of income taxes |  | 0 | 0 | 0 | 0 | 0 | 0
Effect of changes in discount rate assumptions during period, net of income taxes |  | 2,428 | 0 | 0 | 0 | 2,428 | 0
Pension liability adjustment during period, net of income taxes |  | 2 | 0 | 0 | 0 | 2 | 0
Dividends to shareholders | [1] | (251) | 0 | 0 | (251) | 0 | 0
Exercise of stock options |  | 3 | 0 | 3 | 0 | 0 | 0
Share-based compensation |  | 14 | 0 | 14 | 0 | 0 | 0
Purchases of treasury stock |  | (651) | 0 | 0 | 0 | 0 | (651)
Treasury stock reissued |  | 17 | 0 | 9 | 0 | 0 | 8
Balance, end of period at Sep. 30, 2022 |  | 19,946 | 135 | 2,615 | 44,680 | (7,505) | (19,979)
Balance, beginning of period at Dec. 31, 2022 |  | 20,140 | 135 | 2,641 | 44,367 | (6,429) | (20,574)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 1,188 | 0 | 0 | 1,188 | 0 | 0
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | (54) | 0 | 0 | 0 | (54) | 0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments |  | 1,991 | 0 | 0 | 0 | 1,991 | 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 |  | (2,794) | 0 | 0 | 0 | (2,794) | 0
Pension liability adjustment during period, net of income taxes |  | 7 | 0 | 0 | 0 | 7 | 0
Dividends to shareholders | [1] | 0 | 0 | 0 | 0 | 0 | 0
Exercise of stock options |  | 3 | 0 | 3 | 0 | 0 | 0
Share-based compensation |  | 14 | 0 | 14 | 0 | 0 | 0
Purchases of treasury stock |  | (732) | 0 | 0 | 0 | 0 | (732)
Treasury stock reissued |  | 20 | 0 | 7 | 0 | 0 | 13
Balance, end of period at Mar. 31, 2023 |  | 19,784 | 135 | 2,665 | 45,555 | (7,278) | (21,293)
Balance, beginning of period at Dec. 31, 2022 |  | 20,140 | 135 | 2,641 | 44,367 | (6,429) | (20,574)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 4,391 |  |  |  |  |
Effect of changes in discount rate assumptions during period, net of income taxes |  | 1,200 |  |  |  |  |
Balance, end of period at Sep. 30, 2023 |  | 22,669 | 136 | 2,729 | 48,257 | (5,760) | (22,693)
Balance, beginning of period at Mar. 31, 2023 |  | 19,784 | 135 | 2,665 | 45,555 | (7,278) | (21,293)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 1,634 | 0 | 0 | 1,634 | 0 | 0
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | (631) | 0 | 0 | 0 | (631) | 0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments |  | 689 | 0 | 0 | 0 | 689 | 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 |  | (165) | 0 | 0 | 0 | (165) | 0
Pension liability adjustment during period, net of income taxes |  | 46 | 0 | 0 | 0 | 46 | 0
Dividends to shareholders | [1] | (252) | 0 | 0 | (252) | 0 | 0
Exercise of stock options |  | 5 | 0 | 5 | 0 | 0 | 0
Share-based compensation |  | 18 | 1 | 17 | 0 | 0 | 0
Purchases of treasury stock |  | (708) | 0 | 0 | 0 | 0 | (708)
Treasury stock reissued |  | 18 | 0 | 10 | 0 | 0 | 8
Balance, end of period at Jun. 30, 2023 |  | 20,439 | 136 | 2,697 | 46,937 | (7,338) | (21,993)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net earnings |  | 1,569 | 0 | 0 | 1,569 | 0 | 0
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | (235) | 0 | 0 | 0 | (235) | 0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments |  | (2,381) | 0 | 0 | 0 | (2,381) | 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 |  | 4,193 | 0 | 0 | 0 | 4,193 | 0
Pension liability adjustment during period, net of income taxes |  | 0 | 0 | 0 | 0 | 0 | 0
Dividends to shareholders | [1] | (249) | 0 | 0 | (249) | 0 | 0
Exercise of stock options |  | 2 | 0 | 2 | 0 | 0 | 0
Share-based compensation |  | 20 | 0 | 20 | 0 | 0 | 0
Purchases of treasury stock |  | (707) | 0 | 0 | 0 | 0 | (707)
Treasury stock reissued |  | 17 | 0 | 10 | 0 | 0 | 7
Balance, end of period at Sep. 30, 2023 |  | $ 22,669 | $ 136 | $ 2,729 | $ 48,257 | $ (5,760) | $ (22,693)
[1] | Dividends to shareholders are recorded in the period in which they are declared.

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