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Fair Values of Certain Financial Liabilities and Other Financial Instruments (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Financial liabilities    
Senior notes $ 2,779 $ 2,778
Credit facility, carrying value 1,481 1,170
Other debt, excluding capital leases, carrying value 5 5
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial liabilities    
Senior notes (Level 1), fair value 2,859 2,932
Significant Other Observable Inputs (Level 2)    
Financial liabilities    
Credit facility (Level 2), fair value 1,488 1,178
Significant Other Observable Inputs (Level 2) | Other debt, excluding capital leases    
Financial liabilities    
Other debt, excluding capital leases (Level 2), fair value $ 5 $ 5