Trading Activities Net Interest Income and Net Gains (Losses) on Trading Activities (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Net Interest Income and Net Gains (Losses) from Trading Activities [Line Items]
Debt securities, interest income	$ 548	$ 529
Equity securities, interest income	170	137
Total interest income	10,181	10,046
Less: Interest expense	132	110
Net interest Income	9,221	8,808
Debt securities, net gains (losses)	(3,648)	(2,106)
Equity securities, net gains (losses)	(824)	1,153
Loans held for sale, net gains (losses)	9	24
Other liabilities	12	0
Derivatives	4,669	1,277
Total net gains from trading activities	218	348
Total trading-related net interest and noninterest income	765	882
Related to trading activities [Member]
Net Interest Income and Net Gains (Losses) from Trading Activities [Line Items]
Equity securities, interest income	120	103
Loans held for sale, interest income	11	12
Total interest income	679	644
Net interest Income	$ 547	$ 534

Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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-Publisher FASB
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Amount of dividend income on investment in equity security, classified as operating.

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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Amount of interest and fee income earned from loans held-for-sale, including interest earned from direct financing and sales-type leases held-for-sale, but excluding mortgage loans held-for sale.

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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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Amount of interest income, amortization of premium and accretion of discount, on investment in debt security measured at fair value with change in fair value recognized in net income (trading); classified as operating.

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Amount of gain (loss) resulting from the difference between the acquisition price and the selling price or fair value of trading assets and trading liabilities, conducted separately from customer trading activities. Includes, but is not limited to, changes in fair value of trading assets and trading liabilities.

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Represents equity securities realized gains (losses) from trading activities and unrealized gains (losses) due to changes in fair value of trading positions.

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Aggregate net gain and losses (whether realized or unrealized) on certain derivative instruments held for trading purposes whether or not settled physically. Excludes economic hedging of mortgage banking and asset/liability management activities.

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Loans Held for Sale Net Gain (Losses) from Trading Activities

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[Line Items] for

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Net Interest and Noninterest Income from Trading Activities

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Amount of unrealized and realized gain (loss) on investment in other liabilities measured at fair value with change in fair value recognized in net income (trading).

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