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Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions | Total | Cumulative effect, period of adoption, adjustment | Cumulative effect, period of adoption, adjusted balance | Common stock | Common stock Cumulative effect, period of adoption, adjustment | Common stock Cumulative effect, period of adoption, adjusted balance | Additional paid-in capital | Additional paid-in capital Cumulative effect, period of adoption, adjustment | Additional paid-in capital Cumulative effect, period of adoption, adjusted balance | Retained earnings | Retained earnings Cumulative effect, period of adoption, adjustment | Retained earnings Cumulative effect, period of adoption, adjusted balance | Accumulated other comprehensive income (loss) | Accumulated other comprehensive income (loss) Cumulative effect, period of adoption, adjustment | Accumulated other comprehensive income (loss) Cumulative effect, period of adoption, adjusted balance | Treasury Stock, Common | Treasury Stock, Common Cumulative effect, period of adoption, adjustment | Treasury Stock, Common Cumulative effect, period of adoption, adjusted balance
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2020 |  | $ 33,559 |  |  | $ 135 |  |  | $ 2,410 |  |  | $ 37,984 |  |  | $ 8,934 |  |  | $ (15,904) |  |
Balance, beginning of period (Accounting Standards Update 2018-12) at Dec. 31, 2020 |  |  | $ (18,894) | $ 14,665 |  | $ 0 | $ 135 |  | $ 0 | $ 2,410 |  | $ (324) | $ 37,660 |  | $ (18,570) | $ (9,636) |  | $ 0 | $ (15,904)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings |  | 4,231 |  |  | 0 |  |  | 0 |  |  | 4,231 |  |  | 0 |  |  | 0 |  |
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | (876) |  |  | 0 |  |  | 0 |  |  | 0 |  |  | (876) |  |  | 0 |  |
Unrealized gains (losses) on fixed maturity securities during the period, net of income taxes and reclassification adjustments |  | (759) |  |  | 0 |  |  | 0 |  |  | 0 |  |  | (759) |  |  | 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 |  | 2,738 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 2,738 |  |  | 0 |  |
Pension liability adjustment during period, net of income taxes |  | 118 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 118 |  |  | 0 |  |
Dividends to shareholders | [1] | (928) |  |  | 0 |  |  | 0 |  |  | (928) |  |  | 0 |  |  | 0 |  |
Exercise of stock options |  | 18 |  |  | 0 |  |  | 18 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Share-based compensation |  | 61 |  |  | 0 |  |  | 61 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Purchases of treasury stock |  | (2,322) |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | (2,322) |  |
Treasury stock reissued |  | 81 |  |  | 0 |  |  | 40 |  |  | 0 |  |  | 0 |  |  | 41 |  |
Balance, end 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 |  | 4,418 |  |  | 0 |  |  | 0 |  |  | 4,418 |  |  | 0 |  |  | 0 |  |
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | (1,579) |  |  | 0 |  |  | 0 |  |  | 0 |  |  | (1,579) |  |  | 0 |  |
Unrealized gains (losses) on fixed maturity securities during the period, net of income taxes and reclassification adjustments |  | (10,304) |  |  | 0 |  |  | 0 |  |  | 0 |  |  | (10,304) |  |  | 0 |  |
Unrealized gains (losses) on derivatives during period, net of income taxes |  | 3 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 3 |  |  | 0 |  |
Effect of changes in discount rate assumptions during period, net of income taxes |  | 13,732 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 13,732 |  |  | 0 |  |
Pension liability adjustment during period, net of income taxes |  | 130 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 130 |  |  | 0 |  |
Dividends to shareholders | [1] | (1,014) |  |  | 0 |  |  | 0 |  |  | (1,014) |  |  | 0 |  |  | 0 |  |
Exercise of stock options |  | 12 |  |  | 0 |  |  | 12 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Share-based compensation |  | 62 |  |  | 0 |  |  | 62 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Purchases of treasury stock |  | (2,425) |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | (2,425) |  |
Treasury stock reissued |  | 74 |  |  | 0 |  |  | 38 |  |  | 0 |  |  | 0 |  |  | 36 |  |
Balance, end 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 |  | 4,659 |  |  | 0 |  |  | 0 |  |  | 4,659 |  |  | 0 |  |  | 0 |  |
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  | (505) |  |  | 0 |  |  | 0 |  |  | 0 |  |  | (505) |  |  | 0 |  |
Unrealized gains (losses) on fixed maturity securities during the period, net of income taxes and reclassification adjustments |  | 1,841 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 1,841 |  |  | 0 |  |
Unrealized gains (losses) on derivatives during period, net of income taxes |  | 5 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 5 |  |  | 0 |  |
Effect of changes in discount rate assumptions during period, net of income taxes |  | (460) |  |  | 0 |  |  | 0 |  |  | 0 |  |  | (460) |  |  | 0 |  |
Pension liability adjustment during period, net of income taxes |  | 28 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 28 |  |  | 0 |  |
Dividends to shareholders | [1] | (1,033) |  |  | 0 |  |  | 0 |  |  | (1,033) |  |  | 0 |  |  | 0 |  |
Exercise of stock options |  | 13 |  |  | 0 |  |  | 13 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Share-based compensation |  | 75 |  |  | 1 |  |  | 74 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Purchases of treasury stock |  | (2,854) |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | (2,854) |  |
Treasury stock reissued |  | 76 |  |  | 0 |  |  | 43 |  |  | 0 |  |  | 0 |  |  | 33 |  |
Balance, end of period at Dec. 31, 2023 |  | $ 21,985 |  |  | $ 136 |  |  | $ 2,771 |  |  | $ 47,993 |  |  | $ (5,520) |  |  | $ (23,395) |  |
[1] | Dividends to shareholders are recorded in the period in which they are declared.

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