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Credit Quality and the Allowance for Loan and Lease Losses - Summary of Amortized Cost Basis of Residential 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%
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 | 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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- Definition

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

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