Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value (Details)

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Assets and Liabilities Measured at Fair Value (Details) (Recurring, USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Current assets:    
Cash equivalents $ 476 $ 342
Long-term liabilities:    
Debt (note 6) 4,149 3,783
Level 1
   
Current assets:    
Cash equivalents 476 342
Level 2
   
Long-term liabilities:    
Debt (note 6) $ 4,149 $ 3,783