Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		$ 198	$ 194	$ 596	$ 600
Other sources of noninterest income		80	86	194	234
Total noninterest income		278	280	790	834
Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		97	96	292	314
Other sources of noninterest income		72	73	169	181
Total noninterest income		169	169	461	495
Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		28	30	87	84
Other sources of noninterest income		1	2	2	6
Total noninterest income		29	32	89	90
Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		73	68	217	202
Other sources of noninterest income		4	1	9	5
Total noninterest income		77	69	226	207
Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0	0	0
Other sources of noninterest income		3	10	14	42
Total noninterest income		3	10	14	42
Card fees
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		67	72	205	227
Card fees | Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		56	60	171	192
Card fees | Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		10	11	31	32
Card fees | Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		1	1	3	3
Card fees | Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0	0	0
Fiduciary income
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		58	58	178	171
Fiduciary income | Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0	0	0
Fiduciary income | Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0	0	0
Fiduciary income | Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		58	58	178	171
Fiduciary income | Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0	0	0
Service charges on deposit accounts
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		50	50	148	145
Service charges on deposit accounts | Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		34	34	101	101
Service charges on deposit accounts | Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		15	14	43	40
Service charges on deposit accounts | Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		1	2	4	4
Service charges on deposit accounts | Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0	0	0
Commercial loan servicing fees
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[1]	5	5	14	15
Commercial loan servicing fees | Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[1]	5	5	14	15
Commercial loan servicing fees | Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[1]	0	0	0	0
Commercial loan servicing fees | Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[1]	0	0	0	0
Commercial loan servicing fees | Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[1]	0	0	0	0
Brokerage fees
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		6	3	14	11
Brokerage fees | Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0	0	0
Brokerage fees | Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0	0	0
Brokerage fees | Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		6	3	14	11
Brokerage fees | Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers		0	0	0	0
Other noninterest income
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[2]	12	6	37	31
Other noninterest income | Commercial Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[2]	2	(3)	6	6
Other noninterest income | Retail Bank
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[2]	3	5	13	12
Other noninterest income | Wealth Management
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[2]	7	4	18	13
Other noninterest income | Finance & Other
Segment Reporting, Revenue Reconciling Item
Total revenue from contracts with customers	[2]	$ 0	$ 0	$ 0	$ 0

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

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