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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, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Money market funds and other | $ 106 | $ 96
Investments of insurance subsidiaries | 483 | 473
Less amounts classified as current assets | (99) | (92)
Asset fair value | 384 | 381
Debt Securities [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt securities | 377 | 377
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] |  |
Money market funds and other | 106 | 96
Investments of insurance subsidiaries | 106 | 96
Less amounts classified as current assets | (99) | (92)
Asset fair value | 7 | 4
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 | 377 | 377
Asset fair value | 377 | 377
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 | $ 377 | $ 377

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