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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Taxes (Textuals) [Abstract]
Effective tax rate (percent)	37.60%	39.80%		38.30%
Impairment			$ 800			$ 800
Nondeductible expense from impairment of goodwill						433
Unrecognized tax benefits from lapse of statute of limitations				$ 51
Unrecognized tax benefits that would impact effective tax rate	$ 26			$ 26
State and Local Jurisdiction
Income Taxes (Textuals) [Abstract]
Valuation allowance						$ 159
FES
Income Taxes (Textuals) [Abstract]
Effective tax rate (percent)	29.60%	58.30%		48.30%	1.80%
Impairment			$ 23
Nondeductible expense from impairment of goodwill		$ 23
FES | State and Local Jurisdiction
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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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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