Significant Accounting Policies (Tables)

6 Months Ended

Jun. 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 June 30, 2012 and December 31, 2011 (in millions):

	June 30, 2012		December 31, 2011
Emission allowances	$	8	$	10
Renewable energy credits	42		39
Contract intangible assets	64		65
	114		114
Less accumulated amortization	29		28
Intangible assets, net	85		86
Less current intangible assets	18		13
	$	67	$	73