Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Loans by origination year
Total retained loans	$ 1,463,808	$ 1,345,473	$ 1,408,905
Gross charge-offs by origination year
Total gross charge-offs	5,906	5,760
Consumer, excluding credit card
Loans by origination year
Total retained loans	367,128	371,855	368,741
Gross charge-offs by origination year
Total gross charge-offs	510	$ 540
Consumer, excluding credit card \| Residential real estate
Loans by origination year
Term loans originated in 2026/2025	11,451		21,183
Term loans originated in 2025/2024	20,120		9,922
Term loans originated in 2024/2023	8,634		14,438
Term loans originated in 2023/2022	13,164		57,598
Term loans originated in 2022/2021	55,549		75,246
Term loans originated prior to 2022/2021	178,545		111,912
Revolving loans within the revolving period	6,898		6,683
Revolving loans converted to term loans	6,303		6,549
Total retained loans	$ 300,664		$ 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	0.14%		0.28%
% of 30 plus days past due to total retained loans, Term loans originated in 2024/2023	0.58%		0.72%
% of 30 plus days past due to total retained loans, Term loans originated in 2023/2022	0.62%		0.59%
% of 30 plus days past due to total retained loans, Term loans originated in 2022/2021	0.61%		0.44%
% of 30 plus days past due to total retained loans, Term loans originated prior to 2022/2021	0.87%		1.26%
% of 30 plus days past due to total retained loans, Revolving loans within the revolving period	0.45%		0.58%
% of 30 plus days past due to total retained loans, Revolving loans converted to term loans	4.25%		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	3		10
Gross charge-offs originated prior to 2022/2021	10		9
Gross charge-offs originated within the revolving period	5		22
Gross charge-offs originated converted to term loans	2		4
Total gross charge-offs	$ 22		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	$ 11,449		21,179
Term loans originated in 2025/2024	20,091		9,894
Term loans originated in 2024/2023	8,584		14,334
Term loans originated in 2023/2022	13,082		57,258
Term loans originated in 2022/2021	55,208		74,916
Term loans originated prior to 2022/2021	176,983		110,489
Revolving loans within the revolving period	6,867		6,644
Revolving loans converted to term loans	6,035		6,246
Total retained loans	298,299		300,960
Consumer, excluding credit card \| Residential real estate \| 30–149 days past due
Loans by origination year
Term loans originated in 2026/2025	2		4
Term loans originated in 2025/2024	24		16
Term loans originated in 2024/2023	39		36
Term loans originated in 2023/2022	42		98
Term loans originated in 2022/2021	136		99
Term loans originated prior to 2022/2021	794		770
Revolving loans within the revolving period	24		27
Revolving loans converted to term loans	166		184
Total retained loans	1,227		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	5		12
Term loans originated in 2024/2023	11		68
Term loans originated in 2023/2022	40		242
Term loans originated in 2022/2021	205		231
Term loans originated prior to 2022/2021	768		653
Revolving loans within the revolving period	7		12
Revolving loans converted to term loans	102		119
Total retained loans	$ 1,138		$ 1,337

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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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