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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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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 | $ 4,700
Maximum Quantifiable Fannie Mae DUS Loss Share Guarantee | 1,700 | 1,700
Estimated Fair Value of the Fannie Mae DUS Loss Share Guarantee | 7 | 7
Fannie Mae Servicing Portfolio, Other, Amount | $ 491 | $ 400

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- Definition The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 + Details
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