Trading Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Trading Assets and Liabilities [Line Items]
Trading debt securities	$ 86,672	$ 88,265
Equity securities, carried at fair value	36,362	39,098
Loans held for sale	19,824	23,617
Gross derivative asset	58,611	45,876
Derivative assets	27,365	21,478
Total trading assets	151,101	139,162
Short sale	26,145	20,685
Gross trading derivative liabilities	50,625	41,238
Derivative liabilities	15,499	9,424
Total trading liabilities	40,756	29,156
Other liabilities [Member]
Trading Assets and Liabilities [Line Items]
Total trading liabilities	237	0
Related to trading activities [Member]
Trading Assets and Liabilities [Line Items]
Equity securities, carried at fair value	34,203	27,476
Loans held for sale	3,984	3,242
Gross derivative asset	63,104	48,325
Netting	(36,862)	(28,146)
Derivative assets	26,242	20,179
Short sale	26,145	20,685
Gross trading derivative liabilities	53,430	42,449
Netting	(39,056)	(33,978)
Derivative liabilities	$ 14,374	$ 8,471

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Total debt and equity financial instruments classified as (1) trading securities and (2) derivative assets. (1) The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition; this is the reason why the trading category of investments in debt and equity securities are bought and sold "principally" for sale in the near term. Transfers into and out of the trading category should be rare. Such financial instruments that are held as of the reporting date are measured at fair value with unrealized holding gains and losses (the difference between fair value and the previously reported carrying amount) included in earnings. (2) Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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