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Supplemental Cash Flows Information (Tables)
 6 Months Ended
Jun. 30, 2012
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flows Information
 
Six Months Ended June 30,
(in millions)
2012
 
2011
Cash paid (received)
 
 
 
Interest (net of amount capitalized)1
$
154

 
$
142

Income taxes
(9
)
 
6

Cash payments under plant operating leases
124

 
189

 
 
 
 
Non-cash activities from vendor financing
$
6

 
$
19

Purchase of equipment with notes payable
$
—

 
$
56

1 
Interest paid for the six months ended June 30, 2012 and 2011 was $167 million and $158 million, respectively. Interest capitalized for the six months ended June 30, 2012 and 2011 was $13 million and $16 million, respectively.