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Discontinued Operations and Assets Held for Sale (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			0 Months Ended	12 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 12, 2014 Hydroelectric Power Plant Projects [Member] Subsequent Event	Dec. 31, 2013 FES	Dec. 31, 2012 FES	Dec. 31, 2011 FES	Feb. 12, 2014 FES Hydroelectric Power Plant Projects [Member] Subsequent Event	Sep. 04, 2013 FERC Hydroelectric Asset Sale plant
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations (net of income taxes of $9, $8 and $8, respectively) (Note 20)				$ 395
Application to Sell Power Plant Projects, Number									11
Assets Held-for-sale, Long Lived	235	0			122	0
Disposal Group, Including Discontinued Operation, Goodwill	29				1
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	26	24	21		22	22	13
Disposal Group, Including Discontinued Operation, Revenue	33	30	42		31	24	24
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax				$ 145				$ 177

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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- Definition

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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