Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2013

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Asset Retirement Obligations [Table Text Block]

AROs consist of the following (in millions):

	As of December 31,
	2013		2012
Trojan decommissioning activities	$	41	$	42
Utility plant	49		39
Non-utility property	10		13
Asset retirement obligations	$	100	$	94

Schedule of Change in Asset Retirement Obligation [Table Text Block]

The following is a summary of the changes in the Company’s AROs (in millions):

	Years Ended December 31,
	2013			2012			2011
Balance as of beginning of year	$	94		$	87		$	64
Liabilities incurred	4			—			1
Liabilities settled	(4		)	(3		)	(4		)
Accretion expense	6			6			4
Revisions in estimated cash flows	—			4			22
Balance as of end of year	$	100		$	94		$	87