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Derivative Financial Instruments - Mark-to-Market Impact of Derivatives on Statements of Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Derivative Instruments Gain Loss [Line Items]        
Mark-to-market gains (losses) recognized $ (5) $ 14 $ (30) $ 46
Interest Expense and Derivative Instruments Hedging Activities [Member]        
Derivative Instruments Gain Loss [Line Items]        
Mark-to-market gains (losses) recognized (1) 19 (32) 51
Designated as Hedging Instrument [Member] | Fair Value [Member]        
Derivative Instruments Gain Loss [Line Items]        
Mark-to-market gains (losses) recognized [1],[2] 4 5 (2) 5
Designated as Hedging Instrument [Member] | Fair Value [Member] | Interest Rate Swaps [Member]        
Derivative Instruments Gain Loss [Line Items]        
Gains (losses) recognized in net income on derivatives 51 6 109 (48)
Gains (losses) recognized in net income on hedged items (55) (8) (116) 50
Net fair value hedge ineffectiveness gains (losses) (4) (2) (7) 2
Designated as Hedging Instrument [Member] | Fair Value [Member] | Cross-Currency Interest Rate Swaps [Member]        
Derivative Instruments Gain Loss [Line Items]        
Gains (losses) recognized in net income on derivatives 115 1 169 (33)
Gains (losses) recognized in net income on hedged items (107) 6 (164) 36
Net fair value hedge ineffectiveness gains (losses) 8 7 5 3
Designated as Hedging Instrument [Member] | Cash Flow [Member]        
Derivative Instruments Gain Loss [Line Items]        
Mark-to-market gains (losses) recognized [2] 0 0 0 0
Trading [Member]        
Derivative Instruments Gain Loss [Line Items]        
Mark-to-market gains (losses) recognized [3] (5) 14 (30) 46
Trading [Member] | Interest Rate Swaps [Member]        
Derivative Instruments Gain Loss [Line Items]        
Mark-to-market gains (losses) recognized $ (5) $ 14 $ (30) $ 46
[1] Recorded in interest expense in the consolidated statements of income.
[2] The accrued interest income (expense) on fair value hedges and cash flow hedges is recorded in interest expense and is excluded from this table
[3] Recorded in “gains (losses) on derivative and hedging activities, net” in the consolidated statements of income