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Employee Benefit Plans - Plan's Assets Carried at Fair Value (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements $ 543 $ 601  
Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 181 186  
Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 262 259  
Other Contract [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 100 156  
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 490 502  
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 181 186  
Fair Value, Inputs, Level 2 [Member] | Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 262 259  
Fair Value, Inputs, Level 2 [Member] | Other Contract [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 47 57  
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements 53 99 $ 108
Fair Value, Inputs, Level 3 [Member] | Other Contract [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value Measurements $ 53 $ 99