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Assets and Liabilities Measured at Fair Value - Schedule of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Assets, Fair Value Disclosure $ 525 $ 504
Less amounts classified as current assets (115) (116)
Investments of insurance subsidiaries, noncurrent 410 388
Interest Rate Swaps [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Liability 28 46
Money Market Funds and Other [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Assets, Fair Value Disclosure 125 88
Debt Securities [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale Securities 400 416
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Assets, Fair Value Disclosure 125 88
Less amounts classified as current assets (73) (87)
Investments of insurance subsidiaries, noncurrent 52 1
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member] | Money Market Funds and Other [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Assets, Fair Value Disclosure 125 88
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Assets, Fair Value Disclosure 400 416
Less amounts classified as current assets (42) (29)
Investments of insurance subsidiaries, noncurrent 358 387
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swaps [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Liability 28 46
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, Available-for-sale Securities $ 400 $ 416