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Summary of Significant Accounting Policies - Securities Loaned and Recognition of Premium Revenues and Contract Charges, and Related Benefits and Interest Credited (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Securities loaned |  |  |
Cash collateral received as percentage of fair value of domestic securities loaned (as a percent) | 102.00% |  |
Cash collateral received as a percent of fair value of foreign securities loaned (as a percent) | 105.00% |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Decrease in unearned premiums | $ (2,120) | $ (2,294) | $ (2,385)
Unearned premium, year one | 2,060 |  |
Unearned premium, year two | 1,520 |  |
Unearned premium, thereafter | 2,030 |  |
Property and casualty insurance premiums | Protection Services |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Decrease in unearned premiums | $ 1,970 | $ 1,840 |
Minimum | Personal Lines |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Property and casualty insurance contract, terms | 6 months |  |
Minimum | Protection Plans and Other Contracts |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC for property-liability insurance | 1 year |  |
Maximum |  |  |
Securities loaned |  |  |
Securities lending transactions length (in days) | 30 days |  |
Maximum | Personal Lines |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Property and casualty insurance contract, terms | 12 months |  |
Maximum | Protection Plans and Other Contracts |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC for property-liability insurance | 5 years |  |

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