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Fair Value - Changes in Level 3 Financial Assets (Details) - Recurring - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 129 | $ 111
Net realized and unrealized capital losses: |  |
Included in earnings | (10) | (9)
Included in other comprehensive income (loss) | 1 | (9)
Purchases | 41 | 95
Sales | (3) | (30)
Settlements |  | 0
Gross transfers out of level 3 | (50) | (29)
Ending balance | 108 | 129
Commercial mortgage-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 0 |
Net realized and unrealized capital losses: |  |
Included in earnings | 0 |
Included in other comprehensive income (loss) | 0 |
Purchases | 13 |
Sales | 0 |
Gross transfers out of level 3 | (13) |
Ending balance | 0 | 0
States, municipalities and political subdivisions |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 0 | 5
Net realized and unrealized capital losses: |  |
Included in earnings |  | 0
Included in other comprehensive income (loss) |  | 0
Purchases |  | 0
Sales |  | (5)
Settlements |  | 0
Gross transfers out of level 3 |  | 0
Ending balance |  | 0
U.S. corporate securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 61 | 38
Net realized and unrealized capital losses: |  |
Included in earnings | (8) | (8)
Included in other comprehensive income (loss) | 1 | (5)
Purchases | 5 | 36
Sales | (1) | 0
Settlements |  | 0
Gross transfers out of level 3 | (29) | 0
Ending balance | 29 | 61
Foreign securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 8 | 10
Net realized and unrealized capital losses: |  |
Included in earnings | 0 | 0
Included in other comprehensive income (loss) | 0 | (2)
Purchases | 0 | 0
Sales | 0 | 0
Settlements |  | 0
Gross transfers out of level 3 | (8) | 0
Ending balance | 0 | 8
Other asset-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 0 | 3
Net realized and unrealized capital losses: |  |
Included in earnings |  |
Included in other comprehensive income (loss) |  | (2)
Purchases |  | 30
Sales |  | (2)
Settlements |  | 0
Gross transfers out of level 3 |  | (29)
Ending balance |  | 0
Equity securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 60 | 55
Net realized and unrealized capital losses: |  |
Included in earnings | (2) | (1)
Included in other comprehensive income (loss) | 0 | 0
Purchases | 23 | 29
Sales | (2) | (23)
Settlements |  | 0
Gross transfers out of level 3 | 0 | 0
Ending balance | $ 79 | $ 60

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) 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)(1a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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