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Fair Value Measurement (Fair Value Option) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value	$ 340	$ 72
Aggregate Unpaid Principal Balance	357	71
Fair Value Less Aggregate Unpaid Principal Balance	(17)	1
Loans and leases, at fair value	76	169
Fair Value, Loans Held as Assets, Aggregate Unpaid Balance, Loans and Long-term Receivables	81	201
Fair Value, Option, Loans Held as Assets, Aggregate Difference	$ (5)	$ (32)

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- Definition

Fair Value, Loans Held as Assets, Aggregate Unpaid Balance, Loans and Long-term Receivables

+ References

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- Definition

Fair Value, Option, Aggregate Unpaid Balance, Loans and Long-term Receivables

+ References

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- Definition

This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (d)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

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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://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-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

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

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Fair value portion of mortgage loans held-for-sale.

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