Goodwill (Tables)

9 Months Ended

Sep. 30, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill, all of which relate to the E&P segment, are as follows (in millions):

Balance at January 1, 2013	$	2,208
Dispositions*		(339	)
Balance at September 30, 2013	$	1,869

* Includes $170 million reclassified to Assets held for sale in 2013.