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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Long-term Purchase Commitment [Line Items] |  |
Fannie Mae DUS Servicing Portfolio, Amount | $ 6,400 | $ 6,200
Fannie Mae Servicing Portfolio, Other, Amount | 580 | $ 653
Maximum Quantifiable Fannie Mae Loss Share Guarantee | $ 2,300 |

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- Definition Fannie Mae Servicing Portfolio, Other, Amount + References No definition available. + Details
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- Definition Maximum Quantifiable Fannie Mae Loss Share Guarantee + References No definition available. + 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 No definition available. + Details
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