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Assets and Liabilities Measured at Fair Value - Summary of Investments of Insurance Subsidiaries Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Money market funds and other $ 339 $ 296
Investments of insurance subsidiaries 667 657
Less amounts classified as current assets (94) (88)
Asset fair value 573 569
Debt Securities [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt securities 328 361
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Money market funds and other 339 296
Investments of insurance subsidiaries 340 296
Less amounts classified as current assets (94) (88)
Asset fair value 246 208
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Debt Securities [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt securities 1  
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments of insurance subsidiaries 327 361
Asset fair value 327 361
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt securities $ 327 $ 361