Asset Retirement Oblilgations (Tables)

12 Months Ended

Dec. 31, 2012

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations By Type [Table Text Block]

The following table presents the Company's ARO liabilities by asset type as of December 31, (in millions):

	2012		2011
Quad Cities Station	$	243	$	230
Fossil fuel facilities	123		114
Wind generating facilities	61		41
Offshore pipeline facilities	36		50
Other	27		35
Total asset retirement obligations	$	490	$	470
Quad Cities Station nuclear decommissioning trust funds	$	337	$	306

Asset Retirement Obligation Disclosure [Table Text Block]

The following table reconciles the beginning and ending balances of the Company's ARO liabilities for the years ended December 31, (in millions):

	2012			2011
Beginning balance	$	470		$	390
Change in estimated costs	10			38
Additions	18			39
Retirements	(32		)	(19		)
Accretion	23			23
Foreign currency exchange rate changes	1			(1		)
Ending balance	$	490		$	470
Reflected as:
Other current liabilities	$	13		$	20
Other long-term liabilities	477			450
Total ARO liability	$	490		$	470