Asset Quality - Schedule of Changes in Allowance for Loan and Lease Losses by Loan Category (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,337	$ 1,061
Provision	88	77
Charge-offs	(60)	(51)
Recoveries	15	18
Ending balance	1,380	1,105
Total ALLL, including discontinued operations, beginning balance	1,358	1,089
Total provision, including discontinued operations	87	78
Total charge-offs, including discontinued operations	(61)	(53)
Total recoveries, including discontinued operations	15	18
Total ALLL — including discontinued operations	1,399	1,132
Provision (credit) for losses on lending-related commitments	51	6
Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	864	688
Provision	50	53
Charge-offs	(39)	(36)
Recoveries	9	12
Ending balance	884	717
Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	473	373
Provision	38	24
Charge-offs	(21)	(15)
Recoveries	6	6
Ending balance	496	388
Commercial and Industrial | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	601	445
Provision	31	63
Charge-offs	(35)	(30)
Recoveries	8	11
Ending balance	605	489
Commercial mortgage | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	203	182
Provision	20	(7)
Charge-offs	(5)	(4)
Recoveries	0	1
Ending balance	218	172
Construction | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	28	29
Provision	0	(4)
Charge-offs	0	0
Recoveries	0	0
Ending balance	28	25
Total commercial real estate loans | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	231	211
Provision	20	(11)
Charge-offs	(5)	(4)
Recoveries	0	1
Ending balance	246	197
Commercial lease financing | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	32	32
Provision	(1)	1
Charge-offs	1	(2)
Recoveries	1	0
Ending balance	33	31
Real estate — residential mortgage | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	196	95
Provision	15	12
Charge-offs	0	1
Recoveries	1	0
Ending balance	212	108
Home equity loans | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	98	110
Provision	(2)	(6)
Charge-offs	(1)	(1)
Recoveries	1	1
Ending balance	96	104
Consumer direct loans | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	111	105
Provision	14	11
Charge-offs	(11)	(7)
Recoveries	2	2
Ending balance	116	111
Credit cards | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	66	61
Provision	13	7
Charge-offs	(9)	(7)
Recoveries	1	2
Ending balance	71	63
Consumer indirect loans | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2	2
Provision	(2)	0
Charge-offs	0	(1)
Recoveries	1	1
Ending balance	1	2
Discontinued operations
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	21	28
Provision	(1)	1
Charge-offs	(1)	(2)
Recoveries	0	0
Ending balance	$ 19	$ 27