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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Long-term Purchase Commitment [Line Items]
Fannie Mae DUS Servicing Portfolio, Amount	$ 6,400	$ 6,200
Fannie Mae Servicing Portfolio, Other, Amount	604	653
Maximum Quantifiable Fannie Mae Loss Share Guarantee	$ 2,200	$ 2,300

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- Definition

Fannie Mae DUS Servicing Portfolio, Amount

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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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