Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value (Details)

v2.4.0.6
Assets and Liabilities Measured at Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Curret assets:    
Interest rate swap arrangements (note 6)   $ 1
Current liabilities:    
Interest rate swap arrangements (note 6)   13
Recurring
   
Curret assets:    
Cash equivalents 314 424
Interest rate swap arrangements (note 6)   1
Current liabilities:    
Interest rate swap arrangements (note 6)   13
Long-term liabilities    
Debt (note 6) 3,703 3,626
Recurring | Level 1
   
Curret assets:    
Cash equivalents 314 424
Recurring | Level 2
   
Curret assets:    
Interest rate swap arrangements (note 6)   1
Current liabilities:    
Interest rate swap arrangements (note 6)   13
Long-term liabilities    
Debt (note 6) $ 3,703 $ 3,626