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Credit Quality and the Allowance for Loan and Lease Losses - Summary of Amortized Cost Basis of Modifications to 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, Allowance for Credit Losses
Financing receivable, excluding accrued interest, modified in period, amount	$ 737	$ 377	$ 1,100	$ 526
Commercial
Financing Receivable, Allowance for Credit Losses
Financing receivable, excluding accrued interest, modified in period, amount	720	333	1,009	455
Commercial | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	86	44	108	79
Commercial | Term Extension
Financing Receivable, Allowance for Credit Losses
Financing receivable, excluding accrued interest, modified in period, amount	704	169	966	221
Commercial | Term Extension | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	28	1	50	1
Commercial | Payment Delay
Financing Receivable, Allowance for Credit Losses
Financing receivable, excluding accrued interest, modified in period, amount	2	164	2	207
Commercial | Payment Delay | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	0	43	0	52
Commercial | Term Extension and Payment Delay | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	39	0	39	26
Commercial | Other | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	19	0	19	0
Commercial | Commercial and industrial loans
Financing Receivable, Allowance for Credit Losses
Financing receivable, excluding accrued interest, modified in period, amount	525	243	775	283
Commercial | Commercial and industrial loans | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	55	44	77	56
Commercial | Commercial and industrial loans | Term Extension
Financing Receivable, Allowance for Credit Losses
Financing receivable, excluding accrued interest, modified in period, amount	511	80	734	116
Commercial | Commercial and industrial loans | Term Extension | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	28	1	50	1
Commercial | Commercial and industrial loans | Payment Delay
Financing Receivable, Allowance for Credit Losses
Financing receivable, excluding accrued interest, modified in period, amount	0	163	0	163
Commercial | Commercial and industrial loans | Payment Delay | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	0	43	0	52
Commercial | Commercial and industrial loans | Term Extension and Payment Delay | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	8	0	8	3
Commercial | Commercial and industrial loans | Other | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	19	0	19	0
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Allowance for Credit Losses
Financing receivable, excluding accrued interest, modified in period, amount	79	49	82	77
Commercial | Commercial mortgage owner-occupied loans | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	0	0	0	23
Commercial | Commercial mortgage owner-occupied loans | Term Extension
Financing Receivable, Allowance for Credit Losses
Financing receivable, excluding accrued interest, modified in period, amount	77	48	80	53
Commercial | Commercial mortgage owner-occupied loans | Term Extension | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	0	0	0	0
Commercial | Commercial mortgage owner-occupied loans | Payment Delay
Financing Receivable, Allowance for Credit Losses
Financing receivable, excluding accrued interest, modified in period, amount	2	1	2	1
Commercial | Commercial mortgage owner-occupied loans | Payment Delay | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	0	0	0	0
Commercial | Commercial mortgage owner-occupied loans | Term Extension and Payment Delay | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	0	0	0	23
Commercial | Commercial mortgage owner-occupied loans | Other | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	0	0	0	0
Commercial | Commercial construction loans
Financing Receivable, Allowance for Credit Losses
Financing receivable, excluding accrued interest, modified in period, amount	33	41	67	93
Commercial | Commercial construction loans | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	31	0	31	0
Commercial | Commercial construction loans | Term Extension
Financing Receivable, Allowance for Credit Losses
Financing receivable, excluding accrued interest, modified in period, amount	33	41	67	50
Commercial | Commercial construction loans | Term Extension | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	0	0	0	0
Commercial | Commercial construction loans | Payment Delay
Financing Receivable, Allowance for Credit Losses
Financing receivable, excluding accrued interest, modified in period, amount	0	0	0	43
Commercial | Commercial construction loans | Payment Delay | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	0	0	0	0
Commercial | Commercial construction loans | Term Extension and Payment Delay | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	31	0	31	0
Commercial | Commercial construction loans | Other | Level 3
Financing Receivable, Allowance for Credit Losses
Amortized cost basis of the modifications to borrowers experiencing financial difficulty	$ 0	$ 0	$ 0	$ 0

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