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Revenue from Contracts with Customers - Summary of Sources of Noninterest Income that are Subject to Revenue Recognition Accounting Guidance (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	$ 388	$ 376	$ 755	$ 759
Service charges on deposit accounts
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	127	119	251	232
Trust income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	170	172	330	366
Brokerage services income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	30	25	59	49
Merchant discount and credit card interchange fees
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	43	42	80	79
Other
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	18	18	35	33
Commercial Bank
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	68	64	136	123
Commercial Bank | Service charges on deposit accounts
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	40	36	80	70
Commercial Bank | Trust income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	1	1	2	1
Commercial Bank | Brokerage services income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	1	1	3	3
Commercial Bank | Merchant discount and credit card interchange fees
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	19	19	36	36
Commercial Bank | Other
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	7	7	15	13
Retail Bank
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	119	114	230	221
Retail Bank | Service charges on deposit accounts
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	87	83	171	162
Retail Bank | Trust income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Retail Bank | Brokerage services income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Retail Bank | Merchant discount and credit card interchange fees
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	24	23	44	43
Retail Bank | Other
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	8	8	15	16
Institutional Services and Wealth Management
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	201	198	389	415
Institutional Services and Wealth Management | Service charges on deposit accounts
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Institutional Services and Wealth Management | Trust income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	169	171	328	365
Institutional Services and Wealth Management | Brokerage services income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	29	24	56	46
Institutional Services and Wealth Management | Merchant discount and credit card interchange fees
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Institutional Services and Wealth Management | Other
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	$ 3	$ 3	$ 5	$ 4

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