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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2013
Table Text Block [Abstract]  
Supplemental Cash Flow Table
The following summarizes cash paid (received) for interest (net of amounts capitalized) and income taxes, as well as non-cash investing transactions:
 
Six Months Ended 
 June 30,
millions
2013
 
2012
Cash paid (received)
 
 
 
Interest
$
313

 
$
354

Income taxes
$
103

 
$
(40
)
Non-cash investing activities
 
 
 
Fair value of properties and equipment received in non-cash exchange transactions
$
13

 
$
31