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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 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | $ 1,496 | $ 871
Fair Value | 1,519 | 896
Fair Value Over / (Under) UPB | 23 | 25
Non-accrual loans: |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 16 | 2
Fair Value | 16 | 2
Fair Value Over / (Under) UPB | 0 | 0
Total other performing loans |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 1,480 | 869
Fair Value | 1,503 | 894
Fair Value Over / (Under) UPB | 23 | 25
Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 1,426 | 871
Fair Value | 1,451 | 896
Fair Value Over / (Under) UPB | 25 | 25
Loans held for sale | Non-accrual loans: |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 16 | 2
Fair Value | 16 | 2
Fair Value Over / (Under) UPB | 0 | 0
Loans held for sale | Total other performing loans |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 1,410 | 869
Fair Value | 1,435 | 894
Fair Value Over / (Under) UPB | 25 | 25
Loans held-for-investment |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 70 | 0
Fair Value | 68 | 0
Fair Value Over / (Under) UPB | (2) | 0
Loans held-for-investment | Total other performing loans |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 70 | 0
Fair Value | 68 | 0
Fair Value Over / (Under) UPB | $ (2) | $ 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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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-30 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-32 + Details
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