Discontinued Operations And Held For Sale Businesses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		0 Months Ended	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Apr. 29, 2013 Kiev and Rivne [Member] business	Jun. 30, 2013 Kiev and Rivne [Member]	Mar. 31, 2013 Kiev and Rivne [Member]	Apr. 29, 2013 Kiev [Member] customer	Apr. 29, 2013 Rivne [Member] customer
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of power distribution businesses sold					2
Net proceeds received from sale of businesses					$ 113
Divestiture Of Ownership In Subsidiary Percent								89.10%	84.60%
Customers Served								881,000	412,000
(Gain) loss on disposal and impairment write-down - discontinued operations			(31)	131		3	(38)
Discontinued Operations Income Loss
Revenue	40	113	187	304
Income (loss) from operations of discontinued businesses, before income tax	1	(2)	14	6
Income tax benefit (expense)	(1)	(3)	0	(5)
Income (loss) from operations of discontinued businesses, after income tax	0	(5)	14	1
Net loss (gain) from disposal and impairments of discontinued businesses, after income tax	$ 3	$ 75	$ (33)	$ 70