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Employee Benefit Plans - Plan's Assets Carried at Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | $ 173 | $ 180
Bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | 90 | 84
Other Contract [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | 83 | 96
Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | 110 | 115
Fair Value, Inputs, Level 2 [Member] | Bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | 90 | 84
Fair Value, Inputs, Level 2 [Member] | Other Contract [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | 20 | 31
Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | 63 | 65
Fair Value, Inputs, Level 3 [Member] | Other Contract [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Fair Value Measurements | $ 63 | $ 65

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