Loans - By Portfolio Segment (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Loan balances by portfolio segment:
Retained loans	$ 1,018,397	$ 948,642	$ 1,010,206
Held-for-sale	6,425		8,688
At fair value	48,463		58,820
Total	1,073,285		1,077,714
Accrued interest receivables	2,800		2,700
Accrued interest receivables written off	12	13
Consumer, excluding credit card
Loan balances by portfolio segment:
Retained loans	296,161	302,392	295,556
Held-for-sale	808		1,287
At fair value	15,520		26,463
Total	312,489		323,306
Credit card
Loan balances by portfolio segment:
Retained loans	152,283		154,296
Held-for-sale	0		0
At fair value	0		0
Total	152,283		154,296
Wholesale
Loan balances by portfolio segment:
Retained loans	569,953	$ 514,478	560,354
Held-for-sale	5,617		7,401
At fair value	32,943		32,357
Total	$ 608,513		$ 600,112

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

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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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