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Investments - Change in unrealized net capital gains and losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |  |
Change in unrealized net capital gains and losses |  |  | $ 530 |
Amounts recognized for: |  |  |  |
Reclassification of noncontrolling interest |  |  | (4) |
Deferred income taxes |  |  | (116) |
Increase in unrealized net capital gains and losses, after-tax | $ (272) | $ (1,144) | 410 | $ (2,738)
Limited partnership interests |  |  |  |
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |  |
Change in unrealized net capital gains and losses |  |  | (2) |
Fixed income securities |  |  |  |
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |  |
Change in unrealized net capital gains and losses |  |  | 531 |
Short-term investments |  |  |  |
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |  |
Change in unrealized net capital gains and losses |  |  | 0 |
Derivative instruments |  |  |  |
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |  |
Change in unrealized net capital gains and losses |  |  | $ 1 |

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- Definition Amount, before tax and after adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 + Details
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- Definition Amount, after adjustment, of tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-12 + Details
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