Other Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Table Text Block [Abstract]

Other Taxes

Taxes incurred, other than income taxes, for the years ended December 31 were as follows: 

millions	2013		2012		2011
Production and severance	$	706	$	855	$	1,094
Ad valorem	277		238		265
Other	94		131		133
Total	$	1,077	$	1,224	$	1,492