Loans and Allowance for Credit Losses - Loans Charged-off (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024/2023	$ 7	$ 0
Originated in 2023/2022	40	104
Originated in 2022/2021	56	15
Originated in 2021/2020	19	10
Originated in 2020/2019	12	16
Originated prior to 2020/2019	26	54
Revolving	435	270
Total charge-offs	595	469
Commercial \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024/2023	0	0
Originated in 2023/2022	26	6
Originated in 2022/2021	18	4
Originated in 2021/2020	8	4
Originated in 2020/2019	4	5
Originated prior to 2020/2019	10	11
Revolving	73	33
Total charge-offs	139	63
Commercial \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024/2023	5	0
Originated in 2023/2022	4	88
Originated in 2022/2021	24	0
Originated in 2021/2020	0	0
Originated in 2020/2019	0	3
Originated prior to 2020/2019	1	32
Revolving	0	0
Total charge-offs	34	123
Financing receivable charge offs relating to uncollectible amount on acquired loans		91
Consumer \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
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 in 2020/2019	0	1
Originated prior to 2020/2019	4	3
Revolving	0	0
Total charge-offs	4	4
Consumer \| Credit card
Financing Receivable, Credit Quality Indicator [Line Items]
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 in 2020/2019	0	0
Originated prior to 2020/2019	0	0
Revolving	337	215
Total charge-offs	337	215
Consumer \| Other retail
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024/2023	2	0
Originated in 2023/2022	10	10
Originated in 2022/2021	14	11
Originated in 2021/2020	11	6
Originated in 2020/2019	8	7
Originated prior to 2020/2019	11	8
Revolving	25	22
Total charge-offs	$ 81	$ 64

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
-SubTopic 20
-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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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
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