Revenue From Contracts With Customers (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		$ 194	$ 194
Other sources of noninterest income		88	50
Total noninterest income		282	244
Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		96	96
Other sources of noninterest income		57	36
Total noninterest income		153	132
Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		27	29
Other sources of noninterest income		1	(1)
Total noninterest income		28	28
Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		71	69
Other sources of noninterest income		2	3
Total noninterest income		73	72
Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0
Other sources of noninterest income		28	12
Total noninterest income		28	12
Card fees
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		69	69
Card fees | Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		58	58
Card fees | Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		10	10
Card fees | Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		1	1
Card fees | Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0
Fiduciary income
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		58	58
Fiduciary income | Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0
Fiduciary income | Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0
Fiduciary income | Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		58	58
Fiduciary income | Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0
Service charges on deposit accounts
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		46	48
Service charges on deposit accounts | Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		31	33
Service charges on deposit accounts | Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		14	14
Service charges on deposit accounts | Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		1	1
Service charges on deposit accounts | Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0
Commercial loan servicing fees
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[1]	3	3	[2]
Commercial loan servicing fees | Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[1]	3	3	[2]
Commercial loan servicing fees | Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[1]	0	0	[2]
Commercial loan servicing fees | Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[1]	0	0	[2]
Commercial loan servicing fees | Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[1]	0	0	[2]
Capital markets income
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[3]	4	2	[2]
Capital markets income | Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[3]	4	2	[2]
Capital markets income | Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[3]	0	0	[2]
Capital markets income | Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[3]	0	0	[2]
Capital markets income | Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[3]	0	0	[2]
Brokerage fees
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		8	4
Brokerage fees | Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0
Brokerage fees | Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0
Brokerage fees | Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		8	4
Brokerage fees | Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0
Other noninterest income
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[3]	6	10	[2]
Other noninterest income | Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[3]	0	0	[2]
Other noninterest income | Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[3]	3	5	[2]
Other noninterest income | Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[3]	3	5	[2]
Other noninterest income | Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[3]	$ 0	$ 0	[2]

[1] Included in commercial lending fees on the Consolidated Statements of Comprehensive Income.

[2] Effective January 1, 2023, the Corporation reported derivative income, syndication agent fees (previously a component of commercial lending fees) and investment banking fees (previously a component of other noninterest income) as a combined item captioned by capital markets income on the Consolidated Statements of Comprehensive Income. Prior periods have been adjusted to conform to this presentation, and the changes in presentation do not impact total noninterest income.

[3] Excludes derivative, warrant and other miscellaneous income.