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Fair Value (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Financial assets (liabilities)    
Long-term debt, including current portion $ (3,888) $ (3,399)
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets (liabilities)    
Available-for-sale securities [1] 59 92
Derivatives [1] 0 0
Long-term debt, including current portion [1] 0 0
Significant Other Observable Inputs (Level 2)    
Financial assets (liabilities)    
Available-for-sale securities [1],[2] 118 94
Derivatives [1],[2] (477) (673)
Long-term debt, including current portion [1],[2] (3,849) (3,381)
Significant Unobservable Inputs (Level 3)    
Financial assets (liabilities)    
Level 3 financial instruments 0 0
Carrying Value    
Financial assets (liabilities)    
Available-for-sale securities [1] 177 186
Derivatives [1] (477) (673)
Long-term debt, including current portion [1] (3,924) (3,425)
Fair Value    
Financial assets (liabilities)    
Available-for-sale securities [1] 177 186
Derivatives [1] (477) (673)
Long-term debt, including current portion [1] $ (3,849) $ (3,381)
[1] We had no Level 3 financial instruments on December 31, 2016 or 2015.
[2] Determined under a market approach using valuation models that incorporate observable inputs such as interest rates, bond yields and quoted prices for similar assets and liabilities.