v3.26.3
Fair Value of Financial Instruments (Narrative) (Detail) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Percentage of level 3 assets at fair value in total assets measured at fair value value 5.00% 5.00%
Percentage of level 3 liabilities at fair value in total liabilities measured at fair value 100.00% 100.00%
Gain (loss) on cumulative changes in instrument-specific credit risk of liabilities elected under the fair value option $ (2,391) $ (2,237)
Cross Currency Swap [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative notional amount 25 28
Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Gain (loss) on cumulative changes in instrument-specific credit risk of liabilities elected under the fair value option (142) (95)
Instrument-specific credit risk of liabilities measured at fair value, net [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Gain (loss) on cumulative changes in instrument-specific credit risk of liabilities elected under the fair value option 17 19
Instrument-specific credit risk of liabilities measured at fair value, net [Member] | Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Gain (loss) on cumulative changes in instrument-specific credit risk of liabilities elected under the fair value option $ 17 $ 19