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Long-Term Investments (Equity Method Investments) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Long-Term Investments [Line Items] |  |  |
Long-Term Investments |  | $ 896 | $ 932
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% |
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 |  | $ 86 | 87
Power [Member] | Partnerships And Corporate Joint Ventures [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Long-Term Investments | [1] | 86 | 87
Power [Member] | Partnerships And Corporate Joint Ventures [Member] | Keystone [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Long-Term Investments |  | 9 | 8
Power [Member] | Partnerships And Corporate Joint Ventures [Member] | Conemaugh [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Long-Term Investments |  | 8 | 8
Power [Member] | Partnerships And Corporate Joint Ventures [Member] | Kalaeloa [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Long-Term Investments |  | $ 69 | $ 71
[1] | During the three years ended December 31, 2018, 2017 and 2016, dividends from these investments were $16 million, $18 million and $18 million, respectively.

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