XML 56 R23.htm IDEA: XBRL DOCUMENT v2.4.0.8
Supplemental Cash Flow Information
 9 Months Ended
Sep. 30, 2013
Disclosure Text Block [Abstract]  
Supplemental Cash Flow Information
14. Supplemental Cash Flow Information

       The following summarizes cash paid (received) for interest (net of amounts capitalized) and income taxes, as well as non-cash investing transactions:
 
Nine Months Ended 
 September 30,
millions
2013
 
2012
Cash paid (received)
 
 
 
Interest
$
569

 
$
613

Income taxes
$
137

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

 
$
65