Loans and Allowance for Credit Losses - Loans Charged-off (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	$ 10	$ 39	$ 20	$ 46
Originated in 2024/2023	64	39	112	79
Originated in 2023/2022	30	81	88	137
Originated in 2022/2021	54	17	103	36
Originated in 2021/2020	16	7	36	19
Originated prior to 2021/2020	27	21	49	47
Revolving	482	448	965	883
Total charge-offs	683	652	1,373	1,247
Commercial \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	10	3	20	3
Originated in 2024/2023	27	26	58	52
Originated in 2023/2022	9	66	38	84
Originated in 2022/2021	7	7	39	15
Originated in 2021/2020	5	2	9	6
Originated prior to 2021/2020	16	11	25	21
Revolving	81	65	153	138
Total charge-offs	155	180	342	319
Commercial \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	0	36	0	41
Originated in 2024/2023	25	2	31	6
Originated in 2023/2022	7	0	21	24
Originated in 2022/2021	35	0	39	0
Originated in 2021/2020	0	0	1	0
Originated prior to 2021/2020	1	0	1	1
Revolving	6	0	6	0
Total charge-offs	74	38	99	72
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	1
Originated in 2022/2021	1	0	1	0
Originated in 2021/2020	1	0	1	0
Originated prior to 2021/2020	2	2	6	6
Revolving	0	0	0	0
Total charge-offs	4	3	8	7
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	373	358	759	695
Total charge-offs	373	358	759	695
Consumer \| Other retail
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	0	0	0	2
Originated in 2024/2023	12	11	23	21
Originated in 2023/2022	14	14	29	28
Originated in 2022/2021	11	10	24	21
Originated in 2021/2020	10	5	25	13
Originated prior to 2021/2020	8	8	17	19
Revolving	22	25	47	50
Total charge-offs	$ 77	$ 73	$ 165	$ 154

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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