Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2014

Asset Retirement Obligations

Change in asset retirement obligations

The following schedule shows the change in our asset retirement obligations for the six months ended June 30, 2014 (dollars in millions):

Asset retirement obligations at January 1, 2014	$	347
Changes attributable to:
Accretion expense	11
Settlements	(10		)
Estimated cash flow revisions	44
Asset retirement obligations at June 30, 2014	$	392