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Employee Benefit Plans Schedule of Pension Plan Assets at Fair Value (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Money market funds $ 1 $ 3  
Equity funds 21 19  
Bond/fixed-income funds 27 27  
Real-estate indirect investments 4 4  
Insurance contracts 11 10 $ 11
Total Assets at fair value 64 63  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Money market funds 0 0  
Equity funds 0 0  
Bond/fixed-income funds 0 0  
Real-estate indirect investments 0 0  
Insurance contracts 0 0  
Total Assets at fair value 0 0  
Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Money market funds 1 3  
Equity funds 21 19  
Bond/fixed-income funds 27 27  
Real-estate indirect investments 4 4  
Insurance contracts 0 0  
Total Assets at fair value 53 53  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Money market funds 0 0  
Equity funds 0 0  
Bond/fixed-income funds 0 0  
Real-estate indirect investments 0 0  
Insurance contracts 11 10  
Total Assets at fair value $ 11 $ 10