Allowance for Credit Losses - Gross Charge-Offs by Year of Origination - Two Years Prior (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward]
2023	$ 10	$ 9	$ 13
2022	5	18	19
2021	16	21	82
2020	33	23	5
2019	32	20	12
Prior to 2019	48	53	54
Revolving Loans	22	13	14
Total	166	157	199
Commercial | C&I
Allowance for Loan and Lease Losses [Roll Forward]
2023	3	1	1
2022	5	16	17
2021	13	15	82
2020	22	23	5
2019	30	3	10
Prior to 2019	39	15	34
Revolving Loans	14	4	7
Total	126	77	156
Commercial | CRE
Allowance for Loan and Lease Losses [Roll Forward]
2023	0	0	0
2022	0	0	0
2021	0	5	0
2020	9	0	0
2019	0	17	2
Prior to 2019	6	34	15
Revolving Loans	0	0	0
Total	15	56	17
Consumer | Credit card and other:
Allowance for Loan and Lease Losses [Roll Forward]
2023	7	8	12
2022	0	1	1
2021	1	1	0
2020	1	0	0
2019	2	0	0
Prior to 2019	1	2	2
Revolving Loans	8	9	7
Total	$ 20	$ 21	$ 22