Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Loans by origination year
Total retained loans	$ 1,497,159	$ 1,369,785	$ 1,408,905
Gross charge-offs by origination year
Total gross charge-offs	8,749	8,941
Consumer, excluding credit card
Loans by origination year
Total retained loans	367,206	369,859	368,741
Gross charge-offs by origination year
Total gross charge-offs	763	$ 814
Consumer, excluding credit card \| Residential real estate
Loans by origination year
Term loans originated in 2026/2025	17,679		21,183
Term loans originated in 2025/2024	19,520		9,922
Term loans originated in 2024/2023	8,289		14,438
Term loans originated in 2023/2022	12,727		57,598
Term loans originated in 2022/2021	54,573		75,246
Term loans originated prior to 2022/2021	173,666		111,912
Revolving loans within the revolving period	6,981		6,683
Revolving loans converted to term loans	6,207		6,549
Total retained loans	$ 299,642		$ 303,531
% 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 2026/2025	0.02%		0.02%
% of 30 plus days past due to total retained loans, Term loans originated in 2025/2024	0.10%		0.28%
% of 30 plus days past due to total retained loans, Term loans originated in 2024/2023	1.81%		0.72%
% of 30 plus days past due to total retained loans, Term loans originated in 2023/2022	0.82%		0.59%
% of 30 plus days past due to total retained loans, Term loans originated in 2022/2021	0.58%		0.44%
% of 30 plus days past due to total retained loans, Term loans originated prior to 2022/2021	0.85%		1.26%
% of 30 plus days past due to total retained loans, Revolving loans within the revolving period	0.43%		0.58%
% of 30 plus days past due to total retained loans, Revolving loans converted to term loans	4.12%		4.63%
% of 30 plus days past due to total retained loans	0.78%		0.84%
Gross charge-offs by origination year
Gross charge-offs originated in 2026/2025	$ 0		$ 0
Gross charge-offs originated in 2025/2024	0		2
Gross charge-offs originated in 2024/2023	0		4
Gross charge-offs originated in 2023/2022	2		7
Gross charge-offs originated in 2022/2021	4		10
Gross charge-offs originated prior to 2022/2021	16		9
Gross charge-offs originated within the revolving period	7		22
Gross charge-offs originated converted to term loans	2		4
Total gross charge-offs	$ 31		58
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	35.00%
Consumer, excluding credit card \| Residential real estate \| Current
Loans by origination year
Term loans originated in 2026/2025	$ 17,675		21,179
Term loans originated in 2025/2024	19,500		9,894
Term loans originated in 2024/2023	8,139		14,334
Term loans originated in 2023/2022	12,623		57,258
Term loans originated in 2022/2021	54,257		74,916
Term loans originated prior to 2022/2021	172,186		110,489
Revolving loans within the revolving period	6,951		6,644
Revolving loans converted to term loans	5,951		6,246
Total retained loans	297,282		300,960
Consumer, excluding credit card \| Residential real estate \| 30–149 days past due
Loans by origination year
Term loans originated in 2026/2025	4		4
Term loans originated in 2025/2024	12		16
Term loans originated in 2024/2023	126		36
Term loans originated in 2023/2022	65		98
Term loans originated in 2022/2021	98		99
Term loans originated prior to 2022/2021	770		770
Revolving loans within the revolving period	23		27
Revolving loans converted to term loans	164		184
Total retained loans	1,262		1,234
Consumer, excluding credit card \| Residential real estate \| 150 or more days past due
Loans by origination year
Term loans originated in 2026/2025	0		0
Term loans originated in 2025/2024	8		12
Term loans originated in 2024/2023	24		68
Term loans originated in 2023/2022	39		242
Term loans originated in 2022/2021	218		231
Term loans originated prior to 2022/2021	710		653
Revolving loans within the revolving period	7		12
Revolving loans converted to term loans	92		119
Total retained loans	$ 1,098		$ 1,337

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 Four 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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