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Segmented Information (Tables)
12 Months Ended
Dec. 31, 2011
Notes To Financial Statements [Abstract]  
Information by geographic area

The following tables provide information by geographic area

In millionsYear ended December 31, 2011  2010  2009
           
Revenues (1)         
 Canada $6,169 $5,630 $4,971
 U.S.   2,859  2,667  2,396
   $9,028 $8,297 $7,367
(1)For the years ended December 31, 2011, 2010 and 2009, the largest customer represented approximately 3% of total revenues for each year.
           
In millionsYear ended December 31, 2011  2010  2009
           
Net income         
 Canada $1,836 $1,498 $1,436
 U.S.   621  606  418
   $2,457 $2,104 $1,854
           
In millionsDecember 31, 2011  2010   
           
Properties         
 Canada $13,824 $13,312   
 U.S.   10,093  9,605   
   $23,917 $22,917