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Fair Value - Reconciliations of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Corporate bonds and other |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Balance at beginning of period | $ 912 | $ 915 | $ 810 | $ 937
Included in Net Income |  | (1) |  | (2)
Included in OCI | (15) | (82) | 9 | (153)
Purchases | 68 | 51 | 149 | 118
Sales |  |  |  | (5)
Settlements | (5) | (37) | (8) | (59)
Transfers into Level 3 | 11 |  | 11 | 10
Transfers out of Level 3 |  |  |  |
Balance at end of period | 971 | 846 | 971 | 846
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at June 30 |  |  |  |
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at June 30 | (15) | (81) | 9 | (153)
States, municipalities and political subdivisions |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Balance at beginning of period | 44 | 51 | 43 | 56
Included in Net Income |  |  |  |
Included in OCI | (1) | (5) |  | (10)
Purchases |  |  |  |
Sales |  |  |  |
Settlements |  |  |  |
Transfers into Level 3 |  |  |  |
Transfers out of Level 3 |  |  |  |
Balance at end of period | 43 | 46 | 43 | 46
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at June 30 |  |  |  |
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at June 30 | (1) | (5) |  | (10)
Asset-backed |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Balance at beginning of period | 859 | 604 | 788 | 556
Included in Net Income | 4 | 8 | 9 | 11
Included in OCI | (7) | (52) |  | (84)
Purchases | 87 | 92 | 142 | 232
Sales |  | (2) |  | (2)
Settlements | (17) | (23) | (26) | (40)
Transfers into Level 3 |  | 14 | 23 | 19
Transfers out of Level 3 | (43) |  | (53) | (51)
Balance at end of period | 883 | 641 | 883 | 641
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at June 30 |  |  |  |
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at June 30 | (7) | (52) | (1) | (83)
Fixed maturities available-for-sale |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Balance at beginning of period | 1,815 | 1,570 | 1,641 | 1,549
Included in Net Income | 4 | 7 | 9 | 9
Included in OCI | (23) | (139) | 9 | (247)
Purchases | 155 | 143 | 291 | 350
Sales | 0 | (2) | 0 | (7)
Settlements | (22) | (60) | (34) | (99)
Transfers into Level 3 | 11 | 14 | 34 | 29
Transfers out of Level 3 | (43) | 0 | (53) | (51)
Balance at end of period | 1,897 | 1,533 | 1,897 | 1,533
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at June 30 | 0 | 0 | 0 | 0
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at June 30 | (23) | (138) | 8 | (246)
Equity securities |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Balance at beginning of period | 29 | 44 | 35 | 29
Included in Net Income | (1) | (3) | (7) |
Included in OCI |  |  |  |
Purchases |  |  |  | 12
Sales | (2) | (3) | (2) | (3)
Settlements |  | 9 |  | 9
Transfers into Level 3 |  |  |  |
Transfers out of Level 3 |  |  |  |
Balance at end of period | 26 | 47 | 26 | 47
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at June 30 | (1) | (3) | (7) | (1)
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at June 30 |  |  |  |

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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) 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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + 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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -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 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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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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