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Fair Value Measures - Differences Between Aggregate Fair Value and Aggregate Remaining Contractual Principal Balance Outstanding - Fair Value Option (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | $ 1,312 | $ 1,095
Fair Value | 1,318 | 1,115
Fair Value Over / (Under) UPB | 6 | 20
Total other performing loans |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 1,310 | 1,095
Fair Value | 1,316 | 1,115
Fair Value Over / (Under) UPB | 6 | 20
Nonaccrual loans: |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 2 |
Fair Value | 2 |
Fair Value Over / (Under) UPB | 0 |
Loans held-for-sale |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 1,312 | 1,095
Fair Value | 1,318 | 1,115
Fair Value Over / (Under) UPB | 6 | 20
Loans held-for-sale | Total other performing loans |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 1,310 | 1,095
Fair Value | 1,316 | 1,115
Fair Value Over / (Under) UPB | 6 | $ 20
Loans held-for-sale | Nonaccrual loans: |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 2 |
Fair Value | 2 |
Fair Value Over / (Under) UPB | 0 |
Loans held-for-investment | Nonaccrual loans: |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 0 |
Fair Value | 0 |
Fair Value Over / (Under) UPB | $ 0 |

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- Definition For loans held as assets for which the fair value option has been elected, this item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of those loans that are 90 days or more past due, in nonaccrual status, or both. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-28 + Details
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