Lending Activities - Loan Modification (Details) $ in Millions	3 Months Ended
Mar. 31, 2024 USD ($)
Composition of Mortgages and other loans receivable
Weighted average term increase from modification (less than)	1 year
Commercial Mortgages
Composition of Mortgages and other loans receivable
Financing receivable, modified loans to percent of two portfolio segments (as a percent) (less than)	1.00%
Other Loans
Composition of Mortgages and other loans receivable
Financing receivable, modified loans to percent of two portfolio segments (as a percent) (less than)	6.00%
Commercial Mortgage Loans \| Extended Maturity
Composition of Mortgages and other loans receivable
Amortized cost of commercial mortgage loans	$ 11
Commercial loans, other loans and notes receivable \| Extended Maturity
Composition of Mortgages and other loans receivable
Amortized cost of commercial mortgage loans	$ 168

Financing Receivable, Excluding Accrued Interest, Modified In Period, To Total Portfolio Segments, Percentage

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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

No definition available.

+ Details

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- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: 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

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- Definition

Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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

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