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Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Taxes (Textuals) [Abstract]
Effective tax rate (percent)		10.70%	38.10%	(12.20%)	38.80%
Impairment				$ 800
Non-deductible expense from impairment of goodwill				433
Unrecognized tax benefits from lapse of statute of limitations				54
Unrecognized tax benefits that would impact effective tax rate		$ 15		$ 15
FES
Income Taxes (Textuals) [Abstract]
Effective tax rate (percent)		24.60%	16.00%	16.60%	20.00%
Impairment				$ 23
Non-deductible expense from impairment of goodwill				23
State and Local Jurisdiction
Income Taxes (Textuals) [Abstract]
Valuation allowance		$ 159		159
Increase resulting from settlements with taxing authorities	$ 69
State and Local Jurisdiction | FES
Income Taxes (Textuals) [Abstract]
Valuation allowance		$ 65		$ 65

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Provision for Income Tax.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible impairment loss.

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