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Financial Instruments - Additional Information (Detail)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2013
Asset-backed Securities [Member]
USD ($)
Dec. 31, 2013
Asset-backed Securities [Member]
CAD
Dec. 31, 2012
Asset-backed Securities [Member]
USD ($)
Dec. 31, 2012
Asset-backed Securities [Member]
CAD
Dec. 31, 2013
Sales [Member]
Customer
Dec. 31, 2013
CANADA
Gigajoule
Dec. 31, 2013
UNITED STATES
MMBTU
Dec. 31, 2013
Forward Contracts [Member]
USD ($)
Dec. 31, 2013
Natural Gas Swap Contracts [Member]
USD ($)
Dec. 31, 2012
Natural Gas Swap Contracts [Member]
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]                        
Foreign exchange forward contracts, gain recognized in other comprehensive income                   $ 62    
Foreign exchange forward contracts, loss recognized in other comprehensive income                   65 1 4
Swaps outstanding fixed price               200,000 200,000      
Swap fixed price               6.50 7.06      
Face value of investments       107   107            
Trading securities 1,646 1,612 92 99 90 90            
Fair value of investments carrying value 4 9                    
Long-term debt due within one year $ 230 $ 249                    
Debt instrument maturity period 1 year                      
Percentage of sales to six largest customers             83.00%          
Number of customers             6