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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2011
Supplemental Cash Flow Information  
Supplemental Cash Flow Information

 

(Millions)

 

2011

 

2010

 

2009

 

Cash income tax payments, net of refunds

 

$

1,542

 

$

1,509

 

$

834

 

Cash interest payments

 

219

 

178

 

233

 

Capitalized interest

 

19

 

17

 

27