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Fair Value Measurements - Differences Between Aggregate Fair Value and Aggregate Remaining Contractual Principal Balance Outstanding (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Unpaid Principal Balance, Loans | $ 1,095 |
Fair Value, Assets | 69 | $ 64
Fair Value, Loans | 1,115 |
Fair Value Over / (Under) UPB, Loans | 20 |
Other Performing Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Unpaid Principal Balance, Assets | 1,095 |
Fair Value, Assets | 1,115 |
Fair Value Over / (Under) UPB, Assets | 20 |
Loans Held-for-Sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Unpaid Principal Balance, Loans | 1,095 |
Fair Value, Loans | 1,115 |
Fair Value Over / (Under) UPB, Loans | 20 |
Loans Held-for-Sale | Other Performing Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Unpaid Principal Balance, Assets | 1,095 |
Fair Value, Assets | 1,115 |
Fair Value Over / (Under) UPB, Assets | $ 20 |

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- Definition This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of long-term debt instruments that have contractual principal amounts and for which the fair value option has been elected. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 + Details
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