Loans - By Portfolio Segment (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Loan balances by portfolio segment:
Retained	$ 1,463,808	$ 1,345,473	$ 1,463,808	$ 1,345,473	$ 1,408,905
Held-for-sale	15,765		15,765		13,840
Loans at fair value	62,889		62,889		70,684
Total	1,542,462		1,542,462		1,493,429
Accrued interest receivables	7,000		7,000		7,000
Accrued interest receivables written off	14	35	31	64
Consumer, excluding credit card
Loan balances by portfolio segment:
Retained	367,128	371,855	367,128	371,855	368,741
Held-for-sale	578		578		334
Loans at fair value	24,037		24,037		33,183
Total	391,743		391,743		402,258
Credit card
Loan balances by portfolio segment:
Retained	249,876		249,876		247,797
Held-for-sale	0		0		0
Loans at fair value	0		0		0
Total	249,876		249,876		247,797
Wholesale
Loan balances by portfolio segment:
Retained	846,804	$ 740,675	846,804	$ 740,675	792,367
Held-for-sale	15,187		15,187		13,506
Loans at fair value	38,852		38,852		37,501
Total	$ 900,843		$ 900,843		$ 843,374

Financing Receivable, Excluding Accrued Interest, Before Allowance For Credit Losses, Net of Deferred Income

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Amount, before allowance for credit loss, of accrued interest on financing receivable.

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Amount of writeoff of accrued interest on financing receivable recognized by reversing interest income.

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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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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.

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