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Investments of Insurance Subsidiaries - Schedule of Investments (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amounts classified as current assets | $ (105) | $ (103)
Investment carrying value | 408 | 438
Amortized Cost | 523 | 525
Unrealized Amounts, Gains | 4 | 18
Unrealized Amounts, Losses | (14) | (2)
Fair Value | 513 | 541
Money Market Funds and Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 112 | 125
Fair Value | 112 | 125
Debt Securities [Member] | States and Municipalities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 411 | 400
Unrealized Amounts, Gains | 4 | 18
Unrealized Amounts, Losses | (14) | (2)
Fair Value | $ 401 | $ 416

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