Loans and Related Allowance for Credit Losses, Consumer Loan Modifications and Financial Effects (Details) - Total Consumer [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 151	$ 97	$ 460	$ 678
Total modifications as a percentage of loan class	0.06%	0.04%	0.18%	0.26%
Weighted average interest rate reduction	1.77%	1.68%	1.80%	1.60%
Weighted average payments deferred (months)	6 months	6 months	6 months	4 months
Weighted average term extension (years)	10 years 8 months 12 days	9 years 4 months 24 days	10 years 9 months 18 days	9 years 8 months 12 days
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Weighted average principal deferred, term	24 years 9 months 18 days	27 years 3 months 18 days	24 years 10 months 24 days	27 years
Residential mortgage [Member] | Trial modifications [Member]
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Loans modified balance end of period	$ 113	$ 115	$ 113	$ 115
Residential mortgage [Member] | Payment delay [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	97	27	290	433
Residential mortgage [Member] | Payment delay with balloon payment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	87	49	284	174
Residential mortgage [Member] | Term extension [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	11	15	30	55
Residential mortgage [Member] | Term extension and payment delay [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	22	22	74	73
Residential mortgage [Member] | Interest rate reduction, and term extension, and payment delay [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	12	18	36	68
Residential mortgage [Member] | All other modifications and combinations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	9	15	30	49
Credit card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 289	$ 151	$ 576	$ 348
Total modifications as a percentage of loan class	0.53%	0.30%	1.05%	0.70%
Weighted average interest rate reduction	22.25%	21.79%	22.14%	21.41%
Credit card [Member] | Interest rate reduction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 289	$ 151	$ 576	$ 348