Commitments and Contingent Liabilities (Narrative Excluding Litigation) (Details) $ in Millions	12 Months Ended
Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Commitments \| Commercial Mortgage Loans
Commitments and Contingent Liabilities [Line Items]
Allowance for credit losses	$ 1	$ 1
Change in allowance for credit losses	0	0
Purchase Investments
Commitments and Contingent Liabilities [Line Items]
Change in allowance for credit losses	$ 0	0
Indemnification \| Securities Lending and Securities Repurchase Transactions
Commitments and Contingent Liabilities [Line Items]
Guarantor Obligations, Liquidation Proceeds, Percentage	102.00%
Indemnification \| Securities Repurchase Transactions
Commitments and Contingent Liabilities [Line Items]
Guarantor Obligations, Liquidation Proceeds, Percentage	95.00%
Indemnification \| Serviced Mortgage Loans
Commitments and Contingent Liabilities [Line Items]
Allowance for credit losses	$ 14	17
Change in allowance for credit losses	(3)	(3)
Mortgages subject to loss-sharing arrangements	$ 24,875	$ 23,937
Weighted-average debt service coverage ratio of mortgages subject to loss-sharing arrangements	1.97	1.92
Weighted-average loan-to-value ratio of mortgages subject to loss-sharing arrangements	60.00%	61.00%
Losses related to indemnifications that were settled	$ 0	$ 0
Indemnification \| Minimum \| Serviced Mortgage Loans
Commitments and Contingent Liabilities [Line Items]
Percentage share of losses incurred on certain loans serviced	4.00%
Indemnification \| Maximum \| Serviced Mortgage Loans
Commitments and Contingent Liabilities [Line Items]
Percentage share of losses incurred on certain loans serviced	20.00%

Average Debt Service Coverage Ratio Of Mortgages Subject To Loss Sharing Arrangements

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- Definition

Average Loan To Value Ratio Of Mortgages Subject To Loss Sharing Arrangements

+ References

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- Definition

Dollar amount of loans serviced by the company that are subject to loss sharing agreements.

+ References

No definition available.

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- Definition

Indicates, if estimable, (as a percentage) the approximate extent to which the proceeds from liquidation of any assets held either as collateral or by third parties would be expected to cover the maximum potential amount of future payments under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

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- Definition

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-1

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Ratio of non-life losses and loss expenses to non-life net premiums earned.

+ References

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- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482454/460-10-45-1

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Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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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.

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