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Investments (Mortgage Loans Allowances Gross charge-offs by Portfolio Segment) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	$ 128	$ 105
OriginatedInCurrentFiscalYear
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Originated In Fiscal Year Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Originated Two Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Originated Three Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Originated Four Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Originated Five Or More Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	128
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	8	77
Agricultural Mortgage Loans | OriginatedInCurrentFiscalYear
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Agricultural Mortgage Loans | Originated In Fiscal Year Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Agricultural Mortgage Loans | Originated Two Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Agricultural Mortgage Loans | Originated Three Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Agricultural Mortgage Loans | Originated Four Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Agricultural Mortgage Loans | Originated Five Or More Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	8
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	120	$ 28
Commercial Mortgage Loans | OriginatedInCurrentFiscalYear
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Commercial Mortgage Loans | Originated In Fiscal Year Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Commercial Mortgage Loans | Originated Two Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Commercial Mortgage Loans | Originated Three Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Commercial Mortgage Loans | Originated Four Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Commercial Mortgage Loans | Originated Five Or More Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	$ 120

X

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (4)
-Publisher SEC

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

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