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Investments of Insurance Subsidiaries - Schedule of Investments (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amounts classified as current assets | $ (103) | $ (116)
Investment carrying value | 438 | 388
Amortized Cost | 525 | 472
Unrealized Amounts, Gains | 18 | 32
Unrealized Amounts, Losses | (2) |
Fair Value | 541 | 504
Money Market Funds and Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 125 | 88
Fair Value | 125 | 88
Debt Securities [Member] | States and Municipalities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 400 | 384
Unrealized Amounts, Gains | 18 | 32
Unrealized Amounts, Losses | (2) |
Fair Value | $ 416 | $ 416

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