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Employee Benefit Plans - Plan's Assets Carried at Fair Value (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements $ 517 $ 588  
Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 140 161  
Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 209 284  
Other Contract [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 168 143  
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 462 527  
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 140 161  
Fair Value, Inputs, Level 2 [Member] | Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 209 284  
Fair Value, Inputs, Level 2 [Member] | Other Contract [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 113 82  
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 55 61 $ 53
Fair Value, Inputs, Level 3 [Member] | Other Contract [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements $ 55 $ 61