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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Long-term Purchase Commitment [Line Items]
Fannie Mae DUS Servicing Portfolio, Amount	$ 7,200	$ 7,000
Fannie Mae Servicing Portfolio, Other, Amount	760	665
Maximum Quantifiable Fannie Mae Loss Share Guarantee	$ 2,500	$ 2,400

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- Definition

Fannie Mae DUS Servicing Portfolio, Amount

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- Definition

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- Definition

Maximum Quantifiable Fannie Mae Loss Share Guarantee

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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.

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