Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2013

Equity [Abstract]

Schedule Of Components Of Other Comprehensive Loss

	Three Months Ended March 31,
	2013			2012
Balance, beginning of period	$	(45	)	$	(50	)
Commodity Derivatives
Balance, beginning of period		(3	)		(16	)
Amount of net pre-tax loss reclassified into income:
Fuel and Purchased Energy expense		3			7
Revenue		—			—
Total net pre-tax loss reclassified into income		3			7
Income Tax expense		(1	)		(2	)
Net change during period		2			5
Balance, end of period		(1	)		(11	)
Treasury Lock
Balance, beginning of period		(10	)		(10	)
Amount of net pre-tax loss reclassified into income:
Interest expense		—			—
Total net pre-tax loss reclassified into income		—			—
Income Tax expense		—			—
Net change during period		—			—
Balance, end of period		(10	)		(10	)
Pension and Other Postretirement Benefit Plans
Balance, beginning of period		(32	)		(24	)
Amount of net pre-tax loss reclassified into income:
Other Operation and Maintenance expense		2			1
Total net pre-tax loss reclassified into income		2			1
Income Tax expense		(1	)		(1	)
Net change during period		1			—
Balance, end of period		(31	)		(24	)
Balance, end of period	$	(42	)	$	(45	)