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Derivative Instruments and Hedging Activities - Gains Losses on Freestanding Derivatives (Details) - Other non-interest income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	$ 56	$ 74
Interest rate contracts:
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	17	17
Interest rate contracts: | Customer accommodation:
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	6	7
Interest rate contracts: | Other interest rate exposures
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	40	68
Commodity contracts | Customer accommodation:
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	7	4
Foreign exchange and other contracts | Customer accommodation:
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	4	6
Other contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	$ (1)	$ (11)

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4CC
-SubTopic 10
-Topic 815
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC

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