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Derivative Financial Instruments - Derivative Notional Values (Detail) - USD ($)
Jun. 30, 2025
Dec. 31, 2024
Derivative [Line Items]    
Total Derivative Notional Values $ 7,500,000,000 $ 7,700,000,000
Designated as Hedging Instrument [Member] | Cash Flow [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 400,000,000 100,000,000
Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 5,400,000,000 5,400,000,000
Trading [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 1,700,000,000 2,200,000,000
Interest Rate Swaps [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 6,200,000,000 6,400,000,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 400,000,000 100,000,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 4,100,000,000 4,100,000,000
Interest Rate Swaps [Member] | Trading [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 1,700,000,000 2,200,000,000
Cross-Currency Interest Rate Swaps [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 1,300,000,000 1,300,000,000
Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 0 0
Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 1,300,000,000 1,300,000,000
Cross-Currency Interest Rate Swaps [Member] | Trading [Member]    
Derivative [Line Items]    
Total Derivative Notional Values $ 0 $ 0