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Loans and Related Allowance for Credit Losses (Commercial FDMs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable [Line Items]
Unfunded lending related commitments	$ 600	$ 400	$ 600	$ 400
Commercial and industrial \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	358	568	593	828
Commercial and industrial \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	117	54	144	69
Commercial real estate \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	729	268	999	550
Commercial real estate \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	32	35	94	35
Total commercial lending
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1,331	$ 915	$ 1,870	$ 1,512
% of Loan Class	0.50%	0.40%	0.71%	0.67%
Total commercial lending \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1,085	$ 818	$ 1,534	$ 1,338
Total commercial lending \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	148		182	66
Total commercial lending \| Interest Rate Reduction and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	1	1	2	2
Total commercial lending \| Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	1	17	56	24
Total commercial lending \| Interest Rate Reduction, Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	14
Total commercial lending \| Other
Financing Receivable [Line Items]
Amortized cost basis, modified	96	7	96	68
Total commercial lending \| Payment Deferral, Adjustment
Financing Receivable [Line Items]
Amortized cost basis, modified		72
Total commercial lending \| Commercial and industrial
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 570	$ 612	$ 821	$ 913
% of Loan Class	0.25%	0.32%	0.36%	0.48%
Total commercial lending \| Commercial and industrial \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 356	$ 550	$ 579	$ 788
Total commercial lending \| Commercial and industrial \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	116		132	31
Total commercial lending \| Commercial and industrial \| Interest Rate Reduction and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	1	1	2	2
Total commercial lending \| Commercial and industrial \| Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	1	17	12	24
Total commercial lending \| Commercial and industrial \| Interest Rate Reduction, Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	14
Total commercial lending \| Commercial and industrial \| Other
Financing Receivable [Line Items]
Amortized cost basis, modified	96	7	96	54
Total commercial lending \| Commercial and industrial \| Payment Deferral, Adjustment
Financing Receivable [Line Items]
Amortized cost basis, modified		37
Total commercial lending \| Commercial real estate
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 761	$ 303	$ 1,049	$ 599
% of Loan Class	2.12%	0.97%	2.92%	1.92%
Total commercial lending \| Commercial real estate \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 729	$ 268	$ 955	$ 550
Total commercial lending \| Commercial real estate \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	32	35	50	35
Total commercial lending \| Commercial real estate \| Interest Rate Reduction and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Total commercial lending \| Commercial real estate \| Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	44	0
Total commercial lending \| Commercial real estate \| Interest Rate Reduction, Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Total commercial lending \| Commercial real estate \| Other
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 0	$ 0	$ 0	$ 14