v3.25.2
Fair Value of Financial Instruments (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
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     6.00% 5.00%
Percentage of level 3 liabilities at fair value in total liabilities measured at fair value     99.00% 99.00%
Gain (loss) on cumulative changes in instrument-specific credit risk of liabilities elected under the fair value option     $ (2,178) $ (2,089)
Accumulated Other Comprehensive Income [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     (96) (128)
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 instrument-specific credit risk recognized in earnings $ 9 $ 28    
Instrument-specific credit risk of liabilities measured at fair value, net [Member] | Accumulated Other Comprehensive Income [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     29 27
Cross Currency Swap [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Derivative notional amount     $ 30 $ 36