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Derivative Instruments - Effect of Fair Value and Cash Flow Hedge Accounting Included in Interest Expense on Consolidated Statement of Income (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]    
Total amount of interest expense presented in the Consolidated Statement of Income $ 893 $ 1,092
Interest Expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Total amount of interest expense presented in the Consolidated Statement of Income 893 1,092
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 1,028 21
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 (1,035) (21)
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 $ 13 $ (8)