Loans and Related Allowance for Credit Losses (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($) portfolio_segment	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) portfolio_segment	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Number of portfolio segments \| portfolio_segment	2		2
Financing receivable, after allowance for credit loss	$ 363,301		$ 363,301		$ 327,071
Allowance for credit loss	5,461	$ 5,282	5,461	$ 5,282	5,200
Total commercial lending
Financing Receivable, Credit Quality Indicator [Line Items]
Subsequently defaulted FDM/ TDR	47	61	70	105
Allowance for credit loss	3,924	3,846	3,924	3,846
Total consumer lending
Financing Receivable, Credit Quality Indicator [Line Items]
Subsequently defaulted FDM/ TDR	31	21	51	48
Allowance for credit loss	1,537	$ 1,436	1,537	$ 1,436
Federal Reserve Bank \| Asset Pledged as Collateral without Right
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, after allowance for credit loss	68,700		68,700		55,000
Federal Home Loan Bank \| Asset Pledged as Collateral without Right
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, after allowance for credit loss	$ 86,600		$ 86,600		$ 80,600