Allowance for Credit Losses - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	$ 25,500
Net addition (reduction) to the allowance for credit losses	749
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Net addition (reduction) to the allowance for credit losses	653
Consumer | Card Services
Financing Receivable, Allowance for Credit Loss [Line Items]
Net addition (reduction) to the allowance for credit losses	753
Consumer | Home Lending
Financing Receivable, Allowance for Credit Loss [Line Items]
Net addition (reduction) to the allowance for credit losses	(125)
Wholesale
Financing Receivable, Allowance for Credit Loss [Line Items]
Net addition (reduction) to the allowance for credit losses	47
Wholesale | First Republic
Financing Receivable, Allowance for Credit Loss [Line Items]
Net addition (reduction) to the allowance for credit losses	200
Wholesale | Secured by real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Net addition (reduction) to the allowance for credit losses	707
Wholesale | Loan and Lending-Related Commitments
Financing Receivable, Allowance for Credit Loss [Line Items]
Net addition (reduction) to the allowance for credit losses	$ (660)