Loans and Allowance for Credit Losses - Loans Charged-off (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	$ 10	$ 7
Originated in 2024/2023	48	40
Originated in 2023/2022	58	56
Originated in 2022/2021	49	19
Originated in 2021/2020	20	12
Originated prior to 2021/2020	22	26
Revolving	483	435
Total charge-offs	690	595
Commercial \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	10	0
Originated in 2024/2023	31	26
Originated in 2023/2022	29	18
Originated in 2022/2021	32	8
Originated in 2021/2020	4	4
Originated prior to 2021/2020	9	10
Revolving	72	73
Total charge-offs	187	139
Commercial \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	0	5
Originated in 2024/2023	6	4
Originated in 2023/2022	14	24
Originated in 2022/2021	4	0
Originated in 2021/2020	1	0
Originated prior to 2021/2020	0	1
Revolving	0	0
Total charge-offs	25	34
Consumer \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	0	0
Originated in 2024/2023	0	0
Originated in 2023/2022	0	0
Originated in 2022/2021	0	0
Originated in 2021/2020	0	0
Originated prior to 2021/2020	4	4
Revolving	0	0
Total charge-offs	4	4
Consumer \| Credit card
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	0	0
Originated in 2024/2023	0	0
Originated in 2023/2022	0	0
Originated in 2022/2021	0	0
Originated in 2021/2020	0	0
Originated prior to 2021/2020	0	0
Revolving	386	337
Total charge-offs	386	337
Consumer \| Other retail
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2025/2024	0	2
Originated in 2024/2023	11	10
Originated in 2023/2022	15	14
Originated in 2022/2021	13	11
Originated in 2021/2020	15	8
Originated prior to 2021/2020	9	11
Revolving	25	25
Total charge-offs	$ 88	$ 81

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
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