Interest Income and Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income
Loans	$ 10,445	$ 10,215	$ 30,777	$ 33,409
Taxable securities	1,553	1,816	4,735	6,203
Non-taxable securities	262	294	809	901
Total investment securities	1,815	2,110	5,544	7,104
Trading assets - debt instruments	1,682	1,850	5,175	5,980
Federal funds sold and securities purchased under resale agreements	231	401	639	2,097
Securities borrowed	(73)	(128)	(240)	(151)
Deposits with banks	174	69	342	708
All other interest-earning assets	206	183	608	826
Total interest income	14,480	14,700	42,845	49,973
Interest expense
Interest-bearing deposits	126	245	404	2,169
Federal funds purchased and securities loaned or sold under repurchase agreements	119	105	194	1,023
Short-term borrowings	31	60	97	335
Trading liabilities – debt and all other interest-bearing liabilities	52	(51)	130	278
Long-term debt	1,054	1,293	3,244	4,679
Beneficial interest issued by consolidated VIEs	18	35	66	184
Total interest expense	1,400	1,687	4,135	8,668
Net interest income	13,080	13,013	38,710	41,305
Provision for credit losses	(1,527)	611	(7,968)	19,369
Net interest income after provision for credit losses	$ 14,607	$ 12,402	$ 46,678	$ 21,936

Interest income on securities that are borrowed in connection with securities financing activities.

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Amount of interest income earned from debt and equity financial instruments classified as (1) trading securities and (2) derivative assets.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Interest expense on beneficial interests issued by consolidated variable interest entities.

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Aggregate amount of interest expense on all deposits.

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The aggregate expense incurred on federal funds purchased and securities sold under agreements to repurchase. If amounts recognized as payables under repurchase agreements have been offset against amounts recognized as receivables under reverse repurchase agreements and reported as a net amount on the balance sheet, the income and expense from these agreements may be reported on a net basis.

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Aggregate amount of interest paid or due on all long-term debt.

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The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase.

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Interest expense incurred on short positions arising from sales of securities and other assets, which the entity does not own, to other parties. Trading liabilities includes the fair value of derivative contracts held for trading that are in loss positions.

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Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.

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Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.

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The net amount of operating interest income (expense).

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The aggregate interest income earned from (1) the lending of excess federal funds to another commercial bank requiring such for its legal reserve requirements and (2) securities purchased under agreements to resell.

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Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

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Amount of interest income earned from interest bearing assets classified as other.

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities exempt from state, federal and other income tax.

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to state, federal and other income tax.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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