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Securities - Pre-Tax Net Securities Gains (Losses) by Type (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total net securities (losses)	$ (30)	$ (35)	$ (17)	$ (65)	$ (35)
U.S. Treasury
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total net securities (losses)	(3)	0	0	0	(12)
Other asset-backed securities (“ABS”)
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total net securities (losses)	0	0	(13)	0	(13)
Non-agency RMBS
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total net securities (losses)	0	(3)	24	(3)	24
Non-U.S. government
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total net securities (losses)	(11)	(28)	(14)	(39)	(13)
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total net securities (losses)	$ (16)	$ (4)	$ (14)	$ (23)	$ (21)

X

- Definition

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

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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 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(2)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

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