Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Loans by origination year
Total retained loans	$ 1,345,473	$ 1,273,047	$ 1,299,590
Gross charge-offs by origination year
Total gross charge-offs	5,760	5,107
Consumer, excluding credit card
Loans by origination year
Total retained loans	371,855	382,795	376,334
Gross charge-offs by origination year
Total gross charge-offs	540	$ 661
Consumer, excluding credit card \| Residential real estate
Loans by origination year
Term loans originated in 2025/2024	8,503		12,314
Term loans originated in 2024/2023	11,619		17,345
Term loans originated in 2023/2022	16,026		61,547
Term loans originated in 2022/2021	59,568		79,938
Term loans originated in 2021/2020	77,417		52,397
Term loans originated prior to 2021/2020	118,151		71,518
Revolving loans within the revolving period	6,783		7,035
Revolving loans converted to term loans	6,994		7,419
Total retained loans	$ 305,061		$ 309,513
% of 30+ days past due to total retained loans by origination year
% of 30 plus days past due to total retained loans, Term loans originated in 2025/2024	0.00%		0.11%
% of 30 plus days past due to total retained loans, Term loans originated in 2024/2023	0.31%		0.37%
% of 30 plus days past due to total retained loans, Term loans originated in 2023/2022	0.71%		0.34%
% of 30 plus days past due to total retained loans, Term loans originated in 2022/2021	0.69%		0.22%
% of 30 plus days past due to total retained loans, Term loans originated in 2021/2020	0.51%		0.21%
% of 30 plus days past due to total retained loans, Term loans originated prior to 2021/2020	1.23%		1.72%
% of 30 plus days past due to total retained loans, Revolving loans within the revolving period	0.81%		0.87%
% of 30 plus days past due to total retained loans, Revolving loans converted to term loans	4.38%		4.46%
% of 30 plus days past due to total retained loans	0.91%		0.71%
Gross charge-offs by origination year
Gross charge-offs originated in 2025/2024	$ 0		$ 0
Gross charge-offs originated in 2024/2023	0		0
Gross charge-offs originated in 2023/2022	1		1
Gross charge-offs originated in 2022/2021	3		1
Gross charge-offs originated in 2021/2020	4		0
Gross charge-offs originated prior to 2021/2020	2		176
Gross charge-offs originated within the revolving period	14		21
Gross charge-offs originated converted to term loans	2		7
Total gross charge-offs	$ 26		206
Consumer, excluding credit card \| Residential real estate \| Senior lien
Gross charge-offs by origination year
Percentage of total revolving loans that are senior lien loans	38.00%
Consumer, excluding credit card \| Residential real estate \| Current
Loans by origination year
Term loans originated in 2025/2024	$ 8,503		12,301
Term loans originated in 2024/2023	11,583		17,280
Term loans originated in 2023/2022	15,912		61,337
Term loans originated in 2022/2021	59,155		79,760
Term loans originated in 2021/2020	77,025		52,289
Term loans originated prior to 2021/2020	116,681		70,270
Revolving loans within the revolving period	6,728		6,974
Revolving loans converted to term loans	6,688		7,088
Total retained loans	302,275		307,299
Consumer, excluding credit card \| Residential real estate \| 30–149 days past due
Loans by origination year
Term loans originated in 2025/2024	0		13
Term loans originated in 2024/2023	33		54
Term loans originated in 2023/2022	95		139
Term loans originated in 2022/2021	290		110
Term loans originated in 2021/2020	304		59
Term loans originated prior to 2021/2020	958		747
Revolving loans within the revolving period	34		53
Revolving loans converted to term loans	175		204
Total retained loans	1,889		1,379
Consumer, excluding credit card \| Residential real estate \| 150 or more days past due
Loans by origination year
Term loans originated in 2025/2024	0		0
Term loans originated in 2024/2023	3		11
Term loans originated in 2023/2022	19		71
Term loans originated in 2022/2021	123		68
Term loans originated in 2021/2020	88		49
Term loans originated prior to 2021/2020	512		501
Revolving loans within the revolving period	21		8
Revolving loans converted to term loans	131		127
Total retained loans	$ 897		$ 835

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Percentage Of Loans Thirty Plus Days Past Due To Total Retained Loans, By Origination Year

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Percentage Of Loans Thirty Plus Days Past Due To Total Retained Loans, Financing Receivable, Converted To Term Loan

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Percentage Of Loans Thirty Plus Days Past Due To Total Retained Loans, Originated Five Or More Years Before Latest Fiscal Year

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Percentage Of Loans Thirty Plus Days Past Due To Total Retained Loans, Originated Three Years Before Latest Fiscal Year

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Percentage Of Loans Thirty Plus Days Past Due To Total Retained Loans, Originated Two Years Before Latest Fiscal Year

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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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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

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Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease.

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