Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Loans by origination year
Total retained loans	$ 1,425,236	$ 1,300,990	$ 1,408,905
Gross charge-offs by origination year
Total gross charge-offs	2,911	2,816
Consumer, excluding credit card
Loans by origination year
Total retained loans	367,274	372,892	368,741
Gross charge-offs by origination year
Total gross charge-offs	261	$ 287
Consumer, excluding credit card \| Residential real estate
Loans by origination year
Term loans originated in 2026/2025	4,972		21,183
Term loans originated in 2025/2024	20,974		9,922
Term loans originated in 2024/2023	9,204		14,438
Term loans originated in 2023/2022	13,800		57,598
Term loans originated in 2022/2021	56,683		75,246
Term loans originated prior to 2022/2021	183,253		111,912
Revolving loans within the revolving period	6,650		6,683
Revolving loans converted to term loans	6,411		6,549
Total retained loans	$ 301,947		$ 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	0.00%		0.02%
% of 30 plus days past due to total retained loans, Term loans originated in 2025/2024	0.21%		0.28%
% of 30 plus days past due to total retained loans, Term loans originated in 2024/2023	0.30%		0.72%
% of 30 plus days past due to total retained loans, Term loans originated in 2023/2022	0.61%		0.59%
% of 30 plus days past due to total retained loans, Term loans originated in 2022/2021	0.71%		0.44%
% of 30 plus days past due to total retained loans, Term loans originated prior to 2022/2021	0.88%		1.26%
% of 30 plus days past due to total retained loans, Revolving loans within the revolving period	0.78%		0.58%
% of 30 plus days past due to total retained loans, Revolving loans converted to term loans	4.65%		4.63%
% of 30 plus days past due to total retained loans	0.83%		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	0		7
Gross charge-offs originated in 2022/2021	2		10
Gross charge-offs originated prior to 2022/2021	4		9
Gross charge-offs originated within the revolving period	2		22
Gross charge-offs originated converted to term loans	1		4
Total gross charge-offs	$ 9		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	36.00%
Consumer, excluding credit card \| Residential real estate \| Current
Loans by origination year
Term loans originated in 2026/2025	$ 4,972		21,179
Term loans originated in 2025/2024	20,929		9,894
Term loans originated in 2024/2023	9,176		14,334
Term loans originated in 2023/2022	13,716		57,258
Term loans originated in 2022/2021	56,282		74,916
Term loans originated prior to 2022/2021	181,633		110,489
Revolving loans within the revolving period	6,598		6,644
Revolving loans converted to term loans	6,113		6,246
Total retained loans	299,419		300,960
Consumer, excluding credit card \| Residential real estate \| 30–149 days past due
Loans by origination year
Term loans originated in 2026/2025	0		4
Term loans originated in 2025/2024	45		16
Term loans originated in 2024/2023	10		36
Term loans originated in 2023/2022	30		98
Term loans originated in 2022/2021	184		99
Term loans originated prior to 2022/2021	824		770
Revolving loans within the revolving period	41		27
Revolving loans converted to term loans	187		184
Total retained loans	1,321		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	0		12
Term loans originated in 2024/2023	18		68
Term loans originated in 2023/2022	54		242
Term loans originated in 2022/2021	217		231
Term loans originated prior to 2022/2021	796		653
Revolving loans within the revolving period	11		12
Revolving loans converted to term loans	111		119
Total retained loans	$ 1,207		$ 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 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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