Derivative Instruments - Summary of Effect of Fair Value and Cash Flow Hedge Accounting on Consolidated Statement of Income (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Interest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total amount of income line items presented in the Consolidated Statement of Income in which the effects of fair value or cash flow hedges are recorded	$ 6,964	$ 3,418
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total amount of income line items presented in the Consolidated Statement of Income in which the effects of fair value or cash flow hedges are recorded	2,330	245
Asset and Liability Management Positions [Member] \| Fair Value Hedges [Member] \| Interest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) Recognized in Earnings related to fair value hedged item	174	(518)
Asset and Liability Management Positions [Member] \| Fair Value Hedges [Member] \| Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) Recognized in Earnings related to fair value hedged item	114	(71)
Asset and Liability Management Positions [Member] \| Fair Value Hedges [Member] \| Interest Rate Contracts [Member] \| Interest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) Recognized in Earnings related to fair value hedge	(178)	517
Asset and Liability Management Positions [Member] \| Fair Value Hedges [Member] \| Interest Rate Contracts [Member] \| Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) Recognized in Earnings related to fair value hedge	(114)	72
Asset and Liability Management Positions [Member] \| Cash Flow Hedges [Member] \| Interest Rate Contracts [Member] \| Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) Recognized in Earnings related to cash flow hedge	$ 7	$ 11

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
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Amount of income line items presented in consolidated statement of income in which effects of fair value or cash flow hedges are recorded.

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