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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Long-term Purchase Commitment [Line Items]
Fannie Mae DUS Servicing Portfolio, Amount	$ 6,200	$ 4,900
Fannie Mae Servicing Portfolio, Other, Amount	660	655
Maximum Quantifiable Fannie Mae Loss Share Guarantee	$ 2,300	$ 1,800

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- Definition

Fannie Mae DUS Servicing Portfolio, Amount

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- Definition

Fannie Mae Servicing Portfolio, Other, 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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