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Investments (Evaluation of Fixed Maturity Securities AFS in an Unrealized Loss Position- Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended |
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Jun. 30, 2025 | Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 29,000 |
Equal to or Greater than 12 Months Gross Unrealized Loss | 25,306 | $ 26,877
Below Investment Grade |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equal to or Greater than 12 Months Gross Unrealized Loss | 456 | $ 552
Fixed maturity securities without an allowance for credit loss |  |
Debt Securities, Available-for-sale [Line Items] |  |
Change in Gross Unrealized Temporary Loss | $ 2,100 |

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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 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: 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 3: 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 4: 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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