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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
	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

X

- Definition

Represents the amount of cash collateral the entity receives for domestic securities loaned, as a percentage of the fair value of the securities.

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Represents the amount of cash collateral the entity receives for foreign securities loaned, as a percentage of the fair value of the securities.

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Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized More Than Two Years From Balance Sheet Date

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Property And Casualty Insurance Contract, Terms

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The usual duration of the entity's securities lending transactions.

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- Definition

Amount of premium revenue under financial guarantee insurance contract to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479032/944-605-50-4

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- Definition

Amount of premium revenue under financial guarantee insurance contract to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of increase (decrease) unearned premiums written. Excludes portion of unearned premiums amortized into income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

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