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Employee Benefit Plans - Plan's Assets Carried at Fair Value (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements $ 381 $ 571  
Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 4 8  
Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 79 372  
Other Contract [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 298 191  
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 343 512  
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 4 8  
Fair Value, Inputs, Level 2 [Member] | Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 79 372  
Fair Value, Inputs, Level 2 [Member] | Other Contract [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 260 132  
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 38 59 $ 66
Fair Value, Inputs, Level 3 [Member] | Other Contract [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements $ 38 $ 59