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Fair Value Measurements - Changes in balances of Level 3 financial assets carried at fair value (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | $ 1,297 | $ 1,128 | $ 1,230 | $ 1,102
Total realized/unrealized gains (losses) included in Net earnings (loss) | 13 | 3 | 31 | 4
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 5 | 8 | 5 | 14
Purchases and issuances | 87 | 45 | 179 | 129
Sales and settlements | (19) | (31) | (32) | (72)
Transfer into Level 3 | 0 | 33 | 0 | 37
Transfer out of Level 3 | (1) | (26) | (31) | (54)
Financial assets, Ending Balance | 1,382 | 1,160 | 1,382 | 1,160
Fixed maturities: |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 742 | 705 | 736 | 664
Total realized/unrealized gains (losses) included in Net earnings (loss) | (1) | (6) | (2) | (1)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 5 | 8 | 5 | 14
Purchases and issuances | 24 | 15 | 72 | 66
Sales and settlements | (13) | (28) | (24) | (47)
Transfer into Level 3 | 0 | 33 | 0 | 37
Transfer out of Level 3 | (1) | (26) | (31) | (32)
Financial assets, Ending Balance | 756 | 701 | 756 | 701
U.S. government agency |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses) included in Net earnings (loss) | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 0 | 0 | 0 | 0
Sales and settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | 0
Financial assets, Ending Balance | 0 | 0 | 0 | 0
State and municipal |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 2 | 5 | 2 | 5
Total realized/unrealized gains (losses) included in Net earnings (loss) | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 0 | 0 | 0 | 0
Sales and settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | 0
Financial assets, Ending Balance | 2 | 5 | 2 | 5
Residential MBS |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 2 | 5 | 2 | 9
Total realized/unrealized gains (losses) included in Net earnings (loss) | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 0 | 0 | 0 | 0
Sales and settlements | 0 | 0 | 0 | (3)
Transfer into Level 3 | 0 | 0 | 0 | 4
Transfer out of Level 3 | 0 | 0 | 0 | (5)
Financial assets, Ending Balance | 2 | 5 | 2 | 5
Commercial MBS |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses) included in Net earnings (loss) | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 0 | 0 | 0 | 0
Sales and settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | 0
Financial assets, Ending Balance | 0 | 0 | 0 | 0
Collateralized loan obligations |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 1 | 1 | 1 | 2
Total realized/unrealized gains (losses) included in Net earnings (loss) | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 0 | 0 | 0 | 0
Sales and settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | (1)
Financial assets, Ending Balance | 1 | 1 | 1 | 1
Other asset-backed securities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 335 | 335 | 351 | 329
Total realized/unrealized gains (losses) included in Net earnings (loss) | (1) | (2) | (1) | (2)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 4 | 0 | 4 | 4
Purchases and issuances | 9 | 3 | 24 | 10
Sales and settlements | (7) | (26) | (12) | (31)
Transfer into Level 3 | 0 | 31 | 0 | 31
Transfer out of Level 3 | 0 | (20) | (26) | (20)
Financial assets, Ending Balance | 340 | 321 | 340 | 321
Corporate and other |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 402 | 359 | 380 | 319
Total realized/unrealized gains (losses) included in Net earnings (loss) | 0 | (4) | (1) | 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 1 | 8 | 1 | 10
Purchases and issuances | 15 | 12 | 48 | 56
Sales and settlements | (6) | (2) | (12) | (13)
Transfer into Level 3 | 0 | 2 | 0 | 2
Transfer out of Level 3 | (1) | (6) | (5) | (6)
Financial assets, Ending Balance | 411 | 369 | 411 | 369
Trading fixed maturities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 0 |  | 0 |
Total realized/unrealized gains (losses) included in Net earnings (loss) | 0 |  | 0 |
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 |  | 0 |
Purchases and issuances | 12 |  | 12 |
Sales and settlements | 0 |  | 0 |
Transfer into Level 3 | 0 |  | 0 |
Transfer out of Level 3 | 0 |  | 0 |
Financial assets, Ending Balance | 12 |  | 12 |
Equity securities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 545 | 411 | 485 | 427
Total realized/unrealized gains (losses) included in Net earnings (loss) | 15 | 10 | 35 | 7
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 48 | 30 | 90 | 61
Sales and settlements | (6) | (3) | (8) | (25)
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | (22)
Financial assets, Ending Balance | 602 | 448 | 602 | 448
Assets of MIE |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 10 | 12 | 9 | 11
Total realized/unrealized gains (losses) included in Net earnings (loss) | (1) | (1) | (2) | (2)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 3 | 0 | 5 | 2
Sales and settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | 0
Financial assets, Ending Balance | $ 12 | $ 11 | $ 12 | $ 11

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