Asset Quality - Schedule of Changes in Allowance for Loan and Lease Losses by Loan Category (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,446	$ 1,547	$ 1,409	$ 1,508
Provision	112	101	361	312
Charge-offs	(140)	(167)	(393)	(395)
Recoveries	26	13	67	69
Ending balance	1,444	1,494	1,444	1,494
Total ALLL, including discontinued operations, beginning balance	1,458	1,561	1,422	1,524
Total provision, including discontinued operations	112	101	361	311
Total charge-offs, including discontinued operations	(141)	(168)	(395)	(398)
Total recoveries, including discontinued operations	27	13	68	70
Total ALLL, including discontinued operations, ending balance	1,456	1,507	1,456	1,507
Provision (credit) for losses on lending-related commitments	(5)	(6)	2	(16)
Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,086	1,160	1,037	1,060
Provision	90	80	309	304
Charge-offs	(114)	(138)	(314)	(307)
Recoveries	21	8	51	53
Ending balance	1,083	1,110	1,083	1,110
Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	360	387	372	448
Provision	22	21	52	8
Charge-offs	(26)	(29)	(79)	(88)
Recoveries	5	5	16	16
Ending balance	361	384	361	384
Commercial and Industrial | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	678	682	639	556
Provision	119	101	285	336
Charge-offs	(87)	(131)	(243)	(279)
Recoveries	21	7	50	46
Ending balance	731	659	731	659
Total commercial real estate loans | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	376	449	371	471
Provision	(22)	(21)	24	(29)
Charge-offs	(27)	(7)	(69)	(22)
Recoveries	0	1	1	2
Ending balance	327	422	327	422
Real estate — commercial mortgage | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	319	383	320	419
Provision	(15)	(19)	25	(41)
Charge-offs	(27)	(7)	(69)	(22)
Recoveries	0	1	1	2
Ending balance	277	358	277	358
Real estate — construction | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	57	66	51	52
Provision	(7)	(2)	(1)	12
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	50	64	50	64
Commercial lease financing | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	32	29	27	33
Provision	(7)	0	0	(3)
Charge-offs	0	0	(2)	(6)
Recoveries	0	0	0	5
Ending balance	25	29	25	29
Real estate — residential mortgage | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	68	115	90	162
Provision	(1)	(5)	(24)	(53)
Charge-offs	0	0	(1)	(2)
Recoveries	1	1	3	4
Ending balance	68	111	68	111
Home equity loans | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	69	71	70	86
Provision	(1)	1	(3)	(14)
Charge-offs	0	(1)	(1)	(2)
Recoveries	0	1	2	2
Ending balance	68	72	68	72
Other consumer loans | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	141	128	136	122
Provision	15	15	43	49
Charge-offs	(15)	(17)	(42)	(49)
Recoveries	2	2	6	6
Ending balance	143	128	143	128
Credit cards | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	82	73	76	78
Provision	9	10	36	26
Charge-offs	(11)	(11)	(35)	(35)
Recoveries	2	1	5	4
Ending balance	82	73	82	73
Discontinued operations
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12	14	13	16
Provision	0	0	0	(1)
Charge-offs	(1)	(1)	(2)	(3)
Recoveries	1	0	1	1
Ending balance	$ 12	$ 13	$ 12	$ 13