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Fair Value Measurements - Changes in Unrealized Gains (Losses) Included in Net Income for Financial Instruments Classified as Level 3 Still Held at Year End (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net realized gains (losses) | Net realized gains (losses)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | $ (25) | $ (2)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Equity securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 2 | 4
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Other Comprehensive Income (Loss) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (199) | (36)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Other Comprehensive Income (Loss) [Member] | Equity securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Securities available-for-sale and other | Total fixed maturities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (3) | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Securities available-for-sale and other | Total fixed maturities | CLO |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Securities available-for-sale and other | Total fixed maturities | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Securities available-for-sale and other | Total fixed maturities | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (3) | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Securities available-for-sale and other | Total fixed maturities | Residential mortgage-backed securities ("RMBS") |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Securities available-for-sale and other | Total fixed maturities | Other Comprehensive Income (Loss) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (199) | (36)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Securities available-for-sale and other | Total fixed maturities | Other Comprehensive Income (Loss) [Member] | CLO |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (1) | (1)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Securities available-for-sale and other | Total fixed maturities | Other Comprehensive Income (Loss) [Member] | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (15) | 1
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Securities available-for-sale and other | Total fixed maturities | Other Comprehensive Income (Loss) [Member] | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (170) | (32)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Securities available-for-sale and other | Total fixed maturities | Other Comprehensive Income (Loss) [Member] | Residential mortgage-backed securities ("RMBS") |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (13) | (4)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Fair Value Option, Other Eligible Items | Total fixed maturities | CLO |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (24) | (6)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Fair Value Option, Other Eligible Items | Total fixed maturities | Other Comprehensive Income (Loss) [Member] | CLO |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | $ 0 | $ 0

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- Definition Indicates line item in statement in which net income is reported that includes unrealized gain (loss) from asset measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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