Loans and Allowance for Credit Losses - Loans Charged-off (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	$ 7	$ 53	$ 27	$ 99
Originated in 2024/2023	39	44	151	123
Originated in 2023/2022	65	83	153	220
Originated in 2022/2021	85	17	188	53
Originated in 2021/2020	13	8	49	27
Originated prior to 2021/2020	22	20	71	67
Revolving	438	444	1,403	1,327
Total charge-offs	669	669	2,042	1,916
Commercial \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	4	10	24	13
Originated in 2024/2023	16	16	74	68
Originated in 2023/2022	12	48	50	132
Originated in 2022/2021	13	8	52	23
Originated in 2021/2020	5	3	14	9
Originated prior to 2021/2020	8	10	33	31
Revolving	71	70	224	208
Total charge-offs	129	165	471	484
Commercial \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	0	39	0	80
Originated in 2024/2023	12	15	43	21
Originated in 2023/2022	34	23	55	47
Originated in 2022/2021	60	0	99	0
Originated in 2021/2020	0	1	1	1
Originated prior to 2021/2020	4	2	5	3
Revolving	0	0	6	0
Total charge-offs	110	80	209	152
Consumer \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	0	0	0	0
Originated in 2024/2023	0	0	0	0
Originated in 2023/2022	0	1	0	2
Originated in 2022/2021	1	0	2	0
Originated in 2021/2020	0	0	1	0
Originated prior to 2021/2020	2	2	8	8
Revolving	0	0	0	0
Total charge-offs	3	3	11	10
Consumer \| Credit card
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	0	0	0	0
Originated in 2024/2023	0	0	0	0
Originated in 2023/2022	0	0	0	0
Originated in 2022/2021	0	0	0	0
Originated in 2021/2020	0	0	0	0
Originated prior to 2021/2020	0	0	0	0
Revolving	344	347	1,103	1,042
Total charge-offs	344	347	1,103	1,042
Consumer \| Other retail
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	3	4	3	6
Originated in 2024/2023	11	13	34	34
Originated in 2023/2022	19	11	48	39
Originated in 2022/2021	11	9	35	30
Originated in 2021/2020	8	4	33	17
Originated prior to 2021/2020	8	6	25	25
Revolving	23	27	70	77
Total charge-offs	$ 83	$ 74	$ 248	$ 228

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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