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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Loss Contingency, Range of Possible Loss, Portion Not Accrued	$ 20
Long-term Purchase Commitment [Line Items]
Fannie Mae DUS Servicing Portfolio, Amount	4,800	$ 4,500
Maximum Quantifiable Fannie Mae DUS Loss Share Guarantee	1,600	1,500
Estimated Fair Value of the Fannie Mae DUS Loss Share Guarantee	$ 5	$ 5

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Estimated Fair Value of the Fannie Mae DUS Loss Share Guarantee

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Fannie Mae DUS Servicing Portfolio, Amount

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Maximum Quantifiable Fannie Mae DUS Loss Share Guarantee

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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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The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 05
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=99385795&loc=d3e12631-108344

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