Loans - By Portfolio Segment (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Loan balances by portfolio segment:
Retained	$ 1,497,159	$ 1,369,785	$ 1,497,159	$ 1,369,785	$ 1,408,905
Held-for-sale	15,824		15,824		13,840
Loans at fair value	71,658		71,658		70,684
Total	1,584,641		1,584,641		1,493,429
Accrued interest receivables	7,600		7,600		7,000
Accrued interest receivables written off	13	22	44	85
Consumer, excluding credit card
Loan balances by portfolio segment:
Retained	367,206	369,859	367,206	369,859	368,741
Held-for-sale	301		301		334
Loans at fair value	25,595		25,595		33,183
Total	393,102		393,102		402,258
Credit card
Loan balances by portfolio segment:
Retained	252,697		252,697		247,797
Held-for-sale	0		0		0
Loans at fair value	0		0		0
Total	252,697		252,697		247,797
Wholesale
Loan balances by portfolio segment:
Retained	877,256	$ 764,451	877,256	$ 764,451	792,367
Held-for-sale	15,523		15,523		13,506
Loans at fair value	46,063		46,063		37,501
Total	$ 938,842		$ 938,842		$ 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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