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Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended
	Mar. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Taxes (Textuals) [Abstract]
Effective tax rate (percent)		39.80%		36.40%
Impairment			$ 800		$ 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)		58.30%		36.80%	1.80%	40.00%
Impairment			23
Non-deductible expense from impairment of goodwill					$ 23
State and Local Jurisdiction
Income Taxes (Textuals) [Abstract]
Valuation allowance			$ 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 loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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