XML 48 R22.htm IDEA: XBRL DOCUMENT v2.4.0.6
Supplemental Cash Flow Information
3 Months Ended
Mar. 31, 2013
Disclosure Text Block [Abstract]  
Supplemental Cash Flow Information

13.  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:

         
    Three Months Ended
    March 31,
millions2013 2012
Cash paid (received)     
 Interest$251 $265
 Income taxes$28 $(70)
Non-cash investing activities     
 Fair value of properties and equipment received in non-cash exchange transactions$13 $