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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) - Fair Value, Recurring [Member] - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | $ (3) | $ 1 | $ (15) | $ 4
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 | (56) | (8) | (238) | (17)
Equity Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 1 | 1 | 2 | 4
Equity Securities [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 | 0 | 0 | 0 | 0
Total Fixed Maturities, AFS | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0 | (2) | 0
Total Fixed Maturities, AFS | Securities available-for-sale and other | 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 | (56) | (8) | (238) | (17)
Total Fixed Maturities, AFS | Collateralized Loan Obligations [Member] | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0 | 0 | 0
Total Fixed Maturities, AFS | Collateralized Loan Obligations [Member] | Securities available-for-sale and other | 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 | 0 | 0 | (2) | 0
Total Fixed Maturities, AFS | Collateralized Loan Obligations [Member] | Fair Value Option, Other Eligible Items |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (4) | 0 | (15) | 0
Total Fixed Maturities, AFS | Collateralized Loan Obligations [Member] | Fair Value Option, Other Eligible Items | 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 | 0 | 0 | 0 | 0
Total Fixed Maturities, AFS | CMBS | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0 | 0 | 0
Total Fixed Maturities, AFS | CMBS | Securities available-for-sale and other | 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 | (1) | 0 | (16) | 2
Total Fixed Maturities, AFS | Corporate | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (1) | 0 | (2) | 0
Total Fixed Maturities, AFS | Corporate | Securities available-for-sale and other | 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 | (52) | (7) | (207) | (16)
Total Fixed Maturities, AFS | Foreign Government/Government Agencies | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 1 | 0 | 0 | 0
Total Fixed Maturities, AFS | Foreign Government/Government Agencies | Securities available-for-sale and other | 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 | 0 | 0 | (1) | 0
Total Fixed Maturities, AFS | RMBS | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0 | 0 | 0
Total Fixed Maturities, AFS | RMBS | Securities available-for-sale and other | 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 | $ (3) | $ (1) | $ (12) | $ (3)

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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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