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Derivative Financial Instruments - Derivative Notional Values (Detail) - USD ($)
Sep. 30, 2022
Dec. 31, 2021
Derivative [Line Items]    
Total Derivative Notional Values $ 49,500,000,000 $ 61,300,000,000
Designated as Hedging Instrument [Member] | Cash Flow [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 9,900,000,000 12,100,000,000
Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 8,100,000,000 8,300,000,000
Trading [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 31,500,000,000 40,900,000,000
Interest Rate Swaps [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 41,600,000,000 46,700,000,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 9,900,000,000 12,100,000,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 6,200,000,000 6,200,000,000
Interest Rate Swaps [Member] | Trading [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 25,500,000,000 28,400,000,000
Floor Income Contracts [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 6,000,000,000.0 12,500,000,000
Floor Income Contracts [Member] | Trading [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 6,000,000,000.0 12,500,000,000
Cross-Currency Interest Rate Swaps [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 1,900,000,000 2,100,000,000
Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative [Line Items]    
Total Derivative Notional Values $ 1,900,000,000 $ 2,100,000,000