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Comprehensive Income
6 Months Ended
Jun. 30, 2011
Notes to Financial Statements [Abstract]  
Comprehensive Income (Loss)
Note 13.  Comprehensive Income
 
Comprehensive income includes net income and certain items recorded directly to shareholders' equity and classified as AOCL. Comprehensive income was calculated as follows:
 
   
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
   
2011
  
2010
  
2011
  
2010
 
(millions)
            
Net Income
 $294  $204  $308  $441 
Other Items of Comprehensive Income (Loss)
                
Oil and Gas Cash Flow Hedges
                
Realized Losses Reclassified Into Earnings
  -   4   -   10 
Less Tax Provision
  -   (1)  -   (4)
Interest Rate Cash Flow Hedges
                
Unrealized Change in Fair Value
  -   (83)  23   (94)
Less Tax Provision
  -   29   (8)  33 
Net Change in Other
  1   1   3   2 
Other Comprehensive Income (Loss)
  1   (50)  18   (53)
Comprehensive Income
 $295  $154  $326  $388