Loans - By Portfolio Segment (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Loan balances by portfolio segment:
Retained loans	$ 1,052,390	$ 963,665	$ 1,052,390	$ 963,665	$ 1,010,206
Held-for-sale	4,709		4,709		8,688
At fair value	47,056		47,056		58,820
Total	1,104,155		1,104,155		1,077,714
Accrued interest receivables	3,200		3,200		2,700
Accrued interest receivables written off	8	8	20	21
Consumer, excluding credit card
Loan balances by portfolio segment:
Retained loans	302,631	297,731	302,631	297,731	295,556
Held-for-sale	740		740		1,287
At fair value	13,841		13,841		26,463
Total	317,212		317,212		323,306
Credit card
Loan balances by portfolio segment:
Retained loans	165,494		165,494		154,296
Held-for-sale	0		0		0
At fair value	0		0		0
Total	165,494		165,494		154,296
Wholesale
Loan balances by portfolio segment:
Retained loans	584,265	$ 524,855	584,265	$ 524,855	560,354
Held-for-sale	3,969		3,969		7,401
At fair value	33,215		33,215		32,357
Total	$ 621,449		$ 621,449		$ 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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