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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

Fair Value, option, loans held as assets unpaid principal balance.

+ References

No definition available.

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- Definition

Fair value, option, long-term debt instruments, loans held for sale.

+ References

No definition available.

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X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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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

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (e)(3)
-URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

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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

No definition available.

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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