Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Loans by origination year
Total retained loans	$ 1,369,785	$ 1,285,370	$ 1,299,590
Gross charge-offs by origination year
Total gross charge-offs	8,941	7,674
Consumer, excluding credit card
Loans by origination year
Total retained loans	369,859	377,938	376,334
Gross charge-offs by origination year
Total gross charge-offs	814	$ 971
Consumer, excluding credit card \| Residential real estate
Loans by origination year
Term loans originated in 2025/2024	14,778		12,314
Term loans originated in 2024/2023	10,808		17,345
Term loans originated in 2023/2022	15,193		61,547
Term loans originated in 2022/2021	58,582		79,938
Term loans originated in 2021/2020	76,435		52,397
Term loans originated prior to 2021/2020	114,676		71,518
Revolving loans within the revolving period	6,681		7,035
Revolving loans converted to term loans	6,683		7,419
Total retained loans	$ 303,836		$ 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	0.01%		0.11%
% of 30 plus days past due to total retained loans, Term loans originated in 2024/2023	0.33%		0.37%
% of 30 plus days past due to total retained loans, Term loans originated in 2023/2022	0.76%		0.34%
% of 30 plus days past due to total retained loans, Term loans originated in 2022/2021	0.72%		0.22%
% of 30 plus days past due to total retained loans, Term loans originated in 2021/2020	0.49%		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	0.76%		0.87%
% of 30 plus days past due to total retained loans, Revolving loans converted to term loans	4.40%		4.46%
% of 30 plus days past due to total retained loans	0.89%		0.71%
Gross charge-offs by origination year
Gross charge-offs originated in 2025/2024	$ 0		$ 0
Gross charge-offs originated in 2024/2023	1		0
Gross charge-offs originated in 2023/2022	2		1
Gross charge-offs originated in 2022/2021	5		1
Gross charge-offs originated in 2021/2020	5		0
Gross charge-offs originated prior to 2021/2020	7		176
Gross charge-offs originated within the revolving period	18		21
Gross charge-offs originated converted to term loans	4		7
Total gross charge-offs	$ 42		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	37.00%
Consumer, excluding credit card \| Residential real estate \| Current
Loans by origination year
Term loans originated in 2025/2024	$ 14,777		12,301
Term loans originated in 2024/2023	10,772		17,280
Term loans originated in 2023/2022	15,077		61,337
Term loans originated in 2022/2021	58,159		79,760
Term loans originated in 2021/2020	76,062		52,289
Term loans originated prior to 2021/2020	113,250		70,270
Revolving loans within the revolving period	6,630		6,974
Revolving loans converted to term loans	6,389		7,088
Total retained loans	301,116		307,299
Consumer, excluding credit card \| Residential real estate \| 30–149 days past due
Loans by origination year
Term loans originated in 2025/2024	1		13
Term loans originated in 2024/2023	28		54
Term loans originated in 2023/2022	54		139
Term loans originated in 2022/2021	149		110
Term loans originated in 2021/2020	146		59
Term loans originated prior to 2021/2020	723		747
Revolving loans within the revolving period	39		53
Revolving loans converted to term loans	183		204
Total retained loans	1,323		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	8		11
Term loans originated in 2023/2022	62		71
Term loans originated in 2022/2021	274		68
Term loans originated in 2021/2020	227		49
Term loans originated prior to 2021/2020	703		501
Revolving loans within the revolving period	12		8
Revolving loans converted to term loans	111		127
Total retained loans	$ 1,397		$ 835

Financing Receivable, Revolving, Percentage Of Senior Liens To Total Financing Receivables

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

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