Investments (Amortized Cost Basis of Loan Modifications made to Borrowers Experiencing Financial Difficulties) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Term Extension \| Commercial mortgage loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amortized cost basis	$ 44	$ 0
% of Amortized Cost	0.00%	0.00%
Term Extension \| Agricultural property loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amortized cost basis	$ 0	$ 0
% of Amortized Cost	0.00%	0.00%
Other Than Insignificant Delay in Payment \| Commercial mortgage loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amortized cost basis	$ 0	$ 0
Other Than Insignificant Delay in Payment \| Agricultural property loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amortized cost basis	$ 0	$ 0

Percentage of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

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- Definition

Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-33

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

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- Details

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- Details

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- Details

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