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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