Loans and Allowance for Credit Losses - Loans Charged-off (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026/2025	$ 22	$ 10	$ 25	$ 20
Originated in 2025/2024	13	64	34	112
Originated in 2024/2023	59	30	132	88
Originated in 2023/2022	57	54	118	103
Originated in 2022/2021	18	16	44	36
Originated prior to 2022/2021	27	27	55	49
Revolving	480	482	951	965
Total charge-offs	676	683	1,359	1,373
Commercial \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026/2025	21	10	24	20
Originated in 2025/2024	4	27	17	58
Originated in 2024/2023	48	9	108	38
Originated in 2023/2022	25	7	70	39
Originated in 2022/2021	6	5	15	9
Originated prior to 2022/2021	12	16	22	25
Revolving	6	12	10	16
Total charge-offs	122	86	266	205
Commercial \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026/2025	0	0	0	0
Originated in 2025/2024	0	25	0	31
Originated in 2024/2023	1	7	4	21
Originated in 2023/2022	18	35	18	39
Originated in 2022/2021	1	0	2	1
Originated prior to 2022/2021	0	1	0	1
Revolving	0	6	0	6
Total charge-offs	20	74	24	99
Consumer \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026/2025	0	0	0	0
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	1	3	1
Originated prior to 2022/2021	4	2	5	6
Revolving	0	0	0	0
Total charge-offs	5	4	8	8
Consumer \| Credit card
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026/2025	0	0	0	0
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 prior to 2022/2021	0	0	0	0
Revolving	446	442	885	896
Total charge-offs	446	442	885	896
Consumer \| Other retail
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026/2025	1	0	1	0
Originated in 2025/2024	9	12	17	23
Originated in 2024/2023	10	14	20	29
Originated in 2023/2022	14	11	30	24
Originated in 2022/2021	10	10	24	25
Originated prior to 2022/2021	11	8	28	17
Revolving	28	22	56	47
Total charge-offs	$ 83	$ 77	$ 176	$ 165

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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