Loans - Consumer, Excluding Credit Card Loan Portfolio, Auto and Other (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 \| Auto and other
Loans by origination year
Term loans originated in 2026/2025	16,540		26,660
Term loans originated in 2025/2024	20,787		15,768
Term loans originated in 2024/2023	12,467		9,670
Term loans originated in 2023/2022	7,094		5,069
Term loans originated in 2022/2021	3,447		3,061
Term loans originated prior to 2022/2021	2,047		871
Revolving loans within the revolving period	3,799		3,852
Revolving loans converted to term loans	283		259
Total retained loans	$ 66,464		$ 65,210
% 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	0.53%		0.64%
% of 30 plus days past due to total retained loans, Term loans originated in 2025/2024	0.75%		1.15%
% of 30 plus days past due to total retained loans, Term loans originated in 2024/2023	1.24%		2.35%
% of 30 plus days past due to total retained loans, Term loans originated in 2023/2022	2.41%		3.35%
% of 30 plus days past due to total retained loans, Term loans originated in 2022/2021	3.42%		3.23%
% of 30 plus days past due to total retained loans, Term loans originated prior to 2022/2021	3.37%		2.87%
% of 30 plus days past due to total retained loans, Revolving loans within the revolving period	0.68%		0.91%
% of 30 plus days past due to total retained loans, Revolving loans converted to term loans	27.56%		31.66%
% of 30 plus days past due to total retained loans	1.29%		1.52%
Gross charge-offs by origination year
Gross charge-offs originated in 2026/2025	$ 74		$ 242
Gross charge-offs originated in 2025/2024	124		228
Gross charge-offs originated in 2024/2023	90		244
Gross charge-offs originated in 2023/2022	93		157
Gross charge-offs originated in 2022/2021	50		69
Gross charge-offs originated prior to 2022/2021	52		83
Gross charge-offs originated within the revolving period	0		0
Gross charge-offs originated converted to term loans	5		8
Total gross charge-offs	488		1,031
Current \| Consumer, excluding credit card \| Auto and other
Loans by origination year
Term loans originated in 2026/2025	16,453		26,490
Term loans originated in 2025/2024	20,632		15,586
Term loans originated in 2024/2023	12,312		9,443
Term loans originated in 2023/2022	6,923		4,899
Term loans originated in 2022/2021	3,329		2,961
Term loans originated prior to 2022/2021	1,978		846
Revolving loans within the revolving period	3,773		3,817
Revolving loans converted to term loans	205		177
Total retained loans	65,605		64,219
30–119 days past due \| Consumer, excluding credit card \| Auto and other
Loans by origination year
Term loans originated in 2026/2025	87		170
Term loans originated in 2025/2024	154		180
Term loans originated in 2024/2023	153		225
Term loans originated in 2023/2022	170		170
Term loans originated in 2022/2021	118		99
Term loans originated prior to 2022/2021	68		25
Revolving loans within the revolving period	25		33
Revolving loans converted to term loans	47		48
Total retained loans	822		950
120 or more days past due \| Consumer, excluding credit card \| Auto and other
Loans by origination year
Term loans originated in 2026/2025	0		0
Term loans originated in 2025/2024	1		2
Term loans originated in 2024/2023	2		2
Term loans originated in 2023/2022	1		0
Term loans originated in 2022/2021	0		1
Term loans originated prior to 2022/2021	1		0
Revolving loans within the revolving period	1		2
Revolving loans converted to term loans	31		34
Total retained loans	$ 37		$ 41

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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, Financing Receivable, Revolving

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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 In Current Fiscal Year

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Percentage Of Loans Thirty Plus Days Past Due To Total Retained Loans, Originated In Fiscal Year 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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- Definition

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 that can be withdrawn, repaid, and redrawn.

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Amortized cost excluding accrued interest, of revolving financing receivable converted to term loan.

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Amortized cost excluding accrued interest, of financing receivable originated four 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 four 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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Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease.

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Amount, excluding accrued interest, of writeoff of financing receivable originated in current fiscal year. Excludes net investment in lease.

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

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