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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) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | $ 0 | $ 12
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, Liabilities | 0 | 0
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 |  | (21)
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 | (36) | 19
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 | (2) | (30)
Fair Value, Recurring [Member] | Contingent Consideration |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | 12
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 | 4 | (9)
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 | (36) | 19
Fair Value, Recurring [Member] | Other Comprehensive Income (Loss) [Member] | Contingent Consideration |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | 0
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
Fair Value, Recurring [Member] | Securities available-for-sale and other | Total fixed maturities | CLOs |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0
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
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 | 0 | (21)
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
Fair Value, Recurring [Member] | Securities available-for-sale and other | Total fixed maturities | Other Comprehensive Income (Loss) [Member] | CLOs |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (1) | 1
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 | 1 | 4
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 | (32) | 24
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 | (4) | (10)
Fair Value, Recurring [Member] | Fair Value Option, Other Eligible Items | Total fixed maturities | CLOs |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (6) | 0
Fair Value, Recurring [Member] | Fair Value Option, Other Eligible Items | Total fixed maturities | Other Comprehensive Income (Loss) [Member] | CLOs |  |
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 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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from liability 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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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