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Employee Benefit Plans - Plan's Assets Carried at Fair Value (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
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