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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
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Money market funds and other $ 306 $ 296
Investments of insurance subsidiaries 657 657
Less amounts classified as current assets (107) (88)
Asset fair value 550 569
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 306 296
Investments of insurance subsidiaries 307 296
Less amounts classified as current assets (107) (88)
Asset fair value 200 208
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 350 361
Asset fair value 350 361
Debt Securities [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt securities 351 361
Debt Securities [Member] | 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]    
Debt securities 1  
Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt securities $ 350 $ 361