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Employee Benefit Plans - Plan's Assets Carried at Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | $ 180 | $ 381
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements |  | 4
Bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | 84 | 79
Other Contract [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | 96 | 298
Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | 115 | 319
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements |  | 4
Fair Value, Inputs, Level 2 [Member] | Bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | 84 | 79
Fair Value, Inputs, Level 2 [Member] | Other Contract [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | 31 | 236
Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | 65 | 62
Fair Value, Inputs, Level 3 [Member] | Other Contract [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | $ 65 | $ 62

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