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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
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | $ 1,230 | $ 1,102
Total realized/unrealized gains (losses) included in Net income | 18 | 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 6
Purchases and issuances | 92 | 84
Sales and settlements | (13) | (41)
Transfer into Level 3 | 0 | 4
Transfer out of Level 3 | (30) | (28)
Financial assets, Ending Balance | 1,297 | 1,128
Fixed maturities: |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 736 | 664
Total realized/unrealized gains (losses) included in Net income | (1) | 5
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 6
Purchases and issuances | 48 | 51
Sales and settlements | (11) | (19)
Transfer into Level 3 | 0 | 4
Transfer out of Level 3 | (30) | (6)
Financial assets, Ending Balance | 742 | 705
U.S. government agency |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 0 | 0
Total realized/unrealized gains (losses) included in Net income | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 0 | 0
Sales and settlements | 0 | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | 0 | 0
Financial assets, Ending Balance | 0 | 0
State and municipal |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 2 | 5
Total realized/unrealized gains (losses) included in Net income | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 0 | 0
Sales and settlements | 0 | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | 0 | 0
Financial assets, Ending Balance | 2 | 5
Residential MBS |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 2 | 9
Total realized/unrealized gains (losses) included in Net income | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 0 | 0
Sales and settlements | 0 | (3)
Transfer into Level 3 | 0 | 4
Transfer out of Level 3 | 0 | (5)
Financial assets, Ending Balance | 2 | 5
Commercial MBS |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 0 | 0
Total realized/unrealized gains (losses) included in Net income | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 0 | 0
Sales and settlements | 0 | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | 0 | 0
Financial assets, Ending Balance | 0 | 0
Collateralized loan obligations |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 1 | 2
Total realized/unrealized gains (losses) included in Net income | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 0 | 0
Sales and settlements | 0 | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | 0 | (1)
Financial assets, Ending Balance | 1 | 1
Other asset-backed securities |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 351 | 329
Total realized/unrealized gains (losses) included in Net income | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 4
Purchases and issuances | 15 | 7
Sales and settlements | (5) | (5)
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | (26) | 0
Financial assets, Ending Balance | 335 | 335
Corporate and other |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 380 | 319
Total realized/unrealized gains (losses) included in Net income | (1) | 5
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 2
Purchases and issuances | 33 | 44
Sales and settlements | (6) | (11)
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | (4) | 0
Financial assets, Ending Balance | 402 | 359
Equity securities |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 485 | 427
Total realized/unrealized gains (losses) included in Net income | 20 | (3)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 42 | 31
Sales and settlements | (2) | (22)
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | 0 | (22)
Financial assets, Ending Balance | 545 | 411
Assets of MIE |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 9 | 11
Total realized/unrealized gains (losses) included in Net income | (1) | (1)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 2 | 2
Sales and settlements | 0 | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | 0 | 0
Financial assets, Ending Balance | $ 10 | $ 12

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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