Loans - Consumer, Excluding Credit Card Loan Portfolio, Auto and Other (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 \| Auto and other
Loans by origination year
Term loans originated in 2026/2025	23,506		26,660
Term loans originated in 2025/2024	18,837		15,768
Term loans originated in 2024/2023	10,990		9,670
Term loans originated in 2023/2022	6,003		5,069
Term loans originated in 2022/2021	2,777		3,061
Term loans originated prior to 2022/2021	1,410		871
Revolving loans within the revolving period	3,734		3,852
Revolving loans converted to term loans	307		259
Total retained loans	$ 67,564		$ 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	0.61%		0.64%
% of 30 plus days past due to total retained loans, Term loans originated in 2025/2024	0.85%		1.15%
% of 30 plus days past due to total retained loans, Term loans originated in 2024/2023	1.36%		2.35%
% of 30 plus days past due to total retained loans, Term loans originated in 2023/2022	2.58%		3.35%
% of 30 plus days past due to total retained loans, Term loans originated in 2022/2021	3.64%		3.23%
% of 30 plus days past due to total retained loans, Term loans originated prior to 2022/2021	3.55%		2.87%
% of 30 plus days past due to total retained loans, Revolving loans within the revolving period	0.59%		0.91%
% of 30 plus days past due to total retained loans, Revolving loans converted to term loans	25.73%		31.66%
% of 30 plus days past due to total retained loans	1.27%		1.52%
Gross charge-offs by origination year
Gross charge-offs originated in 2026/2025	$ 160		$ 242
Gross charge-offs originated in 2025/2024	163		228
Gross charge-offs originated in 2024/2023	130		244
Gross charge-offs originated in 2023/2022	135		157
Gross charge-offs originated in 2022/2021	69		69
Gross charge-offs originated prior to 2022/2021	70		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	732		1,031
Current \| Consumer, excluding credit card \| Auto and other
Loans by origination year
Term loans originated in 2026/2025	23,363		26,490
Term loans originated in 2025/2024	18,677		15,586
Term loans originated in 2024/2023	10,841		9,443
Term loans originated in 2023/2022	5,848		4,899
Term loans originated in 2022/2021	2,676		2,961
Term loans originated prior to 2022/2021	1,359		846
Revolving loans within the revolving period	3,712		3,817
Revolving loans converted to term loans	228		177
Total retained loans	66,704		64,219
30–119 days past due \| Consumer, excluding credit card \| Auto and other
Loans by origination year
Term loans originated in 2026/2025	143		170
Term loans originated in 2025/2024	160		180
Term loans originated in 2024/2023	148		225
Term loans originated in 2023/2022	154		170
Term loans originated in 2022/2021	101		99
Term loans originated prior to 2022/2021	50		25
Revolving loans within the revolving period	21		33
Revolving loans converted to term loans	46		48
Total retained loans	823		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	0		2
Term loans originated in 2024/2023	1		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	33		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 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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