Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2012

Accounting Policies [Abstract]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

The Company has certain intangible assets relating to emission allowances, renewable energy credits and non-utility contracts. Summary of intangible assets as of September 30, 2012 and December 31, 2011 (in millions):

	September 30, 2012		December 31, 2011
Emission allowances	$	7	$	10
Renewable energy credits	43		39
Contract intangible assets	65		65
	115		114
Less accumulated amortization	30		28
Intangible assets, net	85		86
Less current intangible assets	18		13
	$	67	$	73