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Employee Benefit Plans - Plan's Assets Carried at Fair Value (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements $ 568 $ 517  
Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 157 140  
Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 227 209  
Other Contract [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 184 168  
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 505 462  
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 157 140  
Fair Value, Inputs, Level 2 [Member] | Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 227 209  
Fair Value, Inputs, Level 2 [Member] | Other Contract [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 121 113  
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 63 55 $ 61
Fair Value, Inputs, Level 3 [Member] | Other Contract [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements $ 63 $ 55