Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2013

Accounting Policies [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Changes in Accumulated Other Comprehensive Loss by Component (a)
	For The Three Months Ended March 31, 2013
	Net Unrealized Gain/(Loss) on Derivatives			Net Unrealized Gain/(Loss) on Investments			Benefit Obligations (b)			Foreign Currency Translation			Total
	(In millions)
Beginning balance, January 1, 2013	$	(4	)	$	(29	)	$	(127	)	$	2		$	(158	)
Other comprehensive income before reclassifications	—			—			—			(1		)	(1		)
Amounts reclassified from accumulated other comprehensive income	—			—			3			—			3
Net current-period other comprehensive income	—			—			3			(1		)	2
Ending balance, March 31, 2013	$	(4	)	$	(29	)	$	(124	)	$	1		$	(156	)

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

The Company has certain intangible assets relating to emission allowances, renewable energy credits and non-utility contracts as shown below:

	March 31,		December 31,
	2013		2012
	(In millions)
Emission allowances	$	5	$	6
Renewable energy credits	46		44
Contract intangible assets	140		139
	191		189
Less accumulated amortization	37		34
Intangible assets, net	154		155
Less current intangible assets	19		20
	$	135	$	135