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Long-Term Investments (Equity Method Investments) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Long-Term Investments [Line Items] |  |  |
Long-Term Investments |  | $ 1,233 | $ 1,307
Keystone [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Location of the affiliated companies, equity method investments |  | PA |
Owned percentage |  | 23.00% |
Conemaugh [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Location of the affiliated companies, equity method investments |  | PA |
Owned percentage |  | 23.00% |
PennEast [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Location of the affiliated companies, equity method investments |  | PA |
Owned percentage |  | 12.00% |
Kalaeloa [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Location of the affiliated companies, equity method investments |  | HI |
Owned percentage |  | 50.00% |
Power [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Long-Term Investments |  | $ 119 | 121
Power [Member] | Partnerships And Corporate Joint Ventures [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Long-Term Investments | [1] | 119 | $ 121
Power [Member] | Partnerships And Corporate Joint Ventures [Member] | Keystone [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Long-Term Investments |  | 0 |
Power [Member] | Partnerships And Corporate Joint Ventures [Member] | Conemaugh [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Long-Term Investments |  | 0 |
Power [Member] | Partnerships And Corporate Joint Ventures [Member] | PennEast [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Long-Term Investments |  | 0 |
Power [Member] | Partnerships And Corporate Joint Ventures [Member] | Kalaeloa [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Long-Term Investments |  | $ 0 |
[1] | During the three years ended December 31, 2015, 2014 and 2013, the amount of dividends from these investments was $16 million, $17 million and $11 million, respectively.

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