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Commitments and Contingent Liabilities (Narrative Excluding Litigation) (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Commitments | Commercial Mortgage Loans |  |  |
Commitments and Contingent Liabilities [Line Items] |  |  |
Allowance for credit losses | $ 1 |  | $ 0
Change in allowance for credit losses | 1 | $ 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 | $ 19 |  | 20
Change in allowance for credit losses | (1) | (1) |
Mortgages subject to loss-sharing arrangements | $ 22,030 |  | $ 21,465
Weighted-average debt service coverage ratio of mortgages subject to loss-sharing arrangements | 2.00 |  | 1.99
Weighted-average loan-to-value ratio of mortgages subject to loss-sharing arrangements | 63.00% |  | 63.00%
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% |  |
Yield Maintenance Guarantee |  |  |
Commitments and Contingent Liabilities [Line Items] |  |  |
Guarantees related to certain investments the Company sold | $ 9 |  | $ 9

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82919202-210446 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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