Loans - By Portfolio Segment (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Loan balances by portfolio segment:
Retained	$ 1,345,473	$ 1,273,047	$ 1,345,473	$ 1,273,047	$ 1,299,590
Held-for-sale	13,219		13,219		7,048
Loans at fair value	53,300		53,300		41,350
Total	1,411,992		1,411,992		1,347,988
Accrued interest receivables	6,600		6,600		6,600
Accrued interest receivables written off	35	0	64	0
Consumer, excluding credit card
Loan balances by portfolio segment:
Retained	371,855	382,795	371,855	382,795	376,334
Held-for-sale	836		836		945
Loans at fair value	21,349		21,349		15,531
Total	394,040		394,040		392,810
Credit card
Loan balances by portfolio segment:
Retained	232,943		232,943		232,860
Held-for-sale	0		0		0
Loans at fair value	0		0		0
Total	232,943		232,943		232,860
Wholesale
Loan balances by portfolio segment:
Retained	740,675	$ 674,152	740,675	$ 674,152	690,396
Held-for-sale	12,383		12,383		6,103
Loans at fair value	31,951		31,951		25,819
Total	$ 785,009		$ 785,009		$ 722,318

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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