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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	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	$ 990	$ 871
Fair Value	1,007	896
Fair Value Over / (Under) UPB	17	25
Total other performing loans
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	990	869
Fair Value	1,007	894
Fair Value Over / (Under) UPB	17	25
Nonaccrual loans:
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	0	2
Fair Value	0	2
Fair Value Over / (Under) UPB	0	0
Loans held-for-sale
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	923	871
Fair Value	941	896
Fair Value Over / (Under) UPB	18	25
Loans held-for-sale | Total other performing loans
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	923	869
Fair Value	941	894
Fair Value Over / (Under) UPB	18	25
Loans held-for-sale | Nonaccrual loans:
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	0	2
Fair Value	0	2
Fair Value Over / (Under) UPB	0	$ 0
Loans held-for-investment
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	67
Fair Value	66
Fair Value Over / (Under) UPB	(1)
Loans held-for-investment | Total other performing loans
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	67
Fair Value	66
Fair Value Over / (Under) UPB	(1)
Loans held-for-investment | Nonaccrual loans:
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	0
Fair Value	0
Fair Value Over / (Under) UPB	$ 0

X

- Definition

This item represents aggregate unpaid principal balance of assets that have contractual principal amounts and for which the fair value option has been elected.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Fair Value, Option, Loans Held as Assets

+ References

No definition available.

+ Details

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X

- 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

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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

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- Details

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