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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, 2024	Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	$ 1,610	$ 871
Fair Value	1,662	896
Fair Value Over / (Under) UPB	52	25
Non-accrual loans:
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	2	2
Fair Value	2	2
Fair Value Over / (Under) UPB	0	0
Total accrual loans
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	1,608	869
Fair Value	1,660	894
Fair Value Over / (Under) UPB	52	25
Loans held for sale
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	1,541	871
Fair Value	1,595	896
Fair Value Over / (Under) UPB	54	25
Loans held for sale | Non-accrual loans:
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	2	2
Fair Value	2	2
Fair Value Over / (Under) UPB	0	0
Loans held for sale | Total accrual loans
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	1,539	869
Fair Value	1,593	894
Fair Value Over / (Under) UPB	54	25
Loans held-for-investment
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	69	0
Fair Value	67	0
Fair Value Over / (Under) UPB	(2)	0
Loans held-for-investment | Total accrual loans
Fair Value, Option, Quantitative Disclosures
Unpaid Principal Balance	69	0
Fair Value	67	0
Fair Value Over / (Under) UPB	$ (2)	$ 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.

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- Definition

Fair Value, Option, Loans Held as Assets

+ References

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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

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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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