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Derivative Instruments - Effect of Fair Value and Cash Flow Hedge Accounting on Consolidated Statement of Income (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ 14,840 $ 17,494 $ 16,173
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 2,015 4,442 3,254
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 (1)    
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 134 44 (5)
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 1    
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 (134) (44) 5
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 $ 10 $ 11 $ (5)