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Employee Bargaining Agreements and Benefit Plans - Plan's Assets Carried at Fair Value (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Total Fair Value Measurements $ 18 $ 5
Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Fair Value Measurements 13  
Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Fair Value Measurements 5 5
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Fair Value Measurements 10  
Equity Securities [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Fair Value Measurements 10  
Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Fair Value Measurements 3  
Fixed Income Securities [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Fair Value Measurements 3  
Other [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Fair Value Measurements 5 5
Other [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Fair Value Measurements $ 5 $ 5