v3.26.1
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, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Derivative Instruments Gain Loss [Line Items]        
Mark-to-market gains (losses) recognized $ 1 $ (5) $ 6 $ (30)
Location, Statement of Income, Balance [Axis]: us-gaap:GainLossOnDerivativeInstrumentsNetPretax        
Derivative Instruments Gain Loss [Line Items]        
Mark-to-market gains (losses) recognized 5 (1) 18 (32)
Designated as Hedging Instrument [Member] | Fair Value [Member]        
Derivative Instruments Gain Loss [Line Items]        
Mark-to-market gains (losses) recognized [1],[2] 4 4 12 (2)
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 (18) 51 (28) 109
Gains (losses) recognized in net income on hedged items 19 (55) 31 (116)
Net fair value hedge ineffectiveness gains (losses) 3 8 9 5
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 (1) 115 (15) 169
Gains (losses) recognized in net income on hedged items 4 (107) 24 (164)
Net fair value hedge ineffectiveness gains (losses) 1 (4) 3 (7)
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] 1 (5) 6 (30)
Trading [Member] | Interest Rate Swaps [Member]        
Derivative Instruments Gain Loss [Line Items]        
Mark-to-market gains (losses) recognized $ 1 $ (5) $ 6 $ (30)
[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