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Employee Bargaining Agreements and Benefit Plans - Plan's Assets Carried at Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value measurements | $ 9 | $ 11
Annuity Contract [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value measurements | 5 | 6
Other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value measurements | 4 | 5
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value measurements | 1 | 1
Level 1 [Member] | Other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value measurements | 1 | 1
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value measurements | 3 | 4
Level 2 [Member] | Other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value measurements | 3 | 4
Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value measurements | 5 | 6
Level 3 [Member] | Annuity Contract [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value measurements | $ 5 | $ 6

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