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Credit Quality and the Allowance for Loan and Lease Losses - Summary of Amortized Cost Basis of Commercial Loans Modified for Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 737	$ 377	$ 1,100	$ 526
Loan modification program, percentage of modifications to total portfolio	0.41%	0.31%	0.59%	0.43%
Commercial
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 720	$ 333	$ 1,009	$ 455
Loan modification program, percentage of modifications to total portfolio	0.59%	0.47%	0.83%	0.64%
Commercial | Term Extension
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 704	$ 169	$ 966	$ 221
Commercial | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	13	0	21	27
Commercial | Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	2	164	2	207
Commercial | Other
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	1	0	20	0
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 525	$ 243	$ 775	$ 283
Loan modification program, percentage of modifications to total portfolio	0.61%	0.46%	0.90%	0.53%
Commercial | Commercial and industrial loans | Term Extension
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 511	$ 80	$ 734	$ 116
Commercial | Commercial and industrial loans | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	13	0	21	4
Commercial | Commercial and industrial loans | Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	163	0	163
Commercial | Commercial and industrial loans | Other
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	1	0	20	0
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 79	$ 49	$ 82	$ 77
Loan modification program, percentage of modifications to total portfolio	0.65%	0.83%	0.67%	1.31%
Commercial | Commercial mortgage owner-occupied loans | Term Extension
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 77	$ 48	$ 80	$ 53
Commercial | Commercial mortgage owner-occupied loans | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	0	0	23
Commercial | Commercial mortgage owner-occupied loans | Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	2	1	2	1
Commercial | Commercial mortgage owner-occupied loans | Other
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	0	0	0
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 83	$ 0	$ 85	$ 2
Loan modification program, percentage of modifications to total portfolio	0.55%	0.00%	0.57%	0.03%
Commercial | Commercial mortgage nonowner-occupied loans | Term Extension
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 83	$ 0	$ 85	$ 2
Commercial | Commercial mortgage nonowner-occupied loans | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	0	0	0
Commercial | Commercial mortgage nonowner-occupied loans | Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	0	0	0
Commercial | Commercial mortgage nonowner-occupied loans | Other
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	0	0	0
Commercial | Commercial construction loans
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 33	$ 41	$ 67	$ 93
Loan modification program, percentage of modifications to total portfolio	0.39%	0.74%	0.79%	1.68%
Commercial | Commercial construction loans | Term Extension
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 33	$ 41	$ 67	$ 50
Commercial | Commercial construction loans | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	0	0	0
Commercial | Commercial construction loans | Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	0	0	43
Commercial | Commercial construction loans | Other
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	0	0	0
Residential Mortgage
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 7	$ 34	$ 23	$ 51
Loan modification program, percentage of modifications to total portfolio	0.04%	0.19%	0.12%	0.29%
Residential Mortgage | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 5	$ 22	$ 14	$ 38
Loan modification program, percentage of modifications to total portfolio	0.03%	0.12%	0.07%	0.21%
Residential Mortgage | Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 2	$ 0	$ 2	$ 0
Loan modification program, percentage of modifications to total portfolio	0.01%	0.00%	0.00%	0.00%
Residential Mortgage | Term extension, interest rate reduction and payment delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	$ 0	$ 12	$ 7	$ 13
Loan modification program, percentage of modifications to total portfolio	0.00%	0.07%	0.04%	0.07%

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Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

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