| Sale of Energy Producing Assets and Goodwill Impairment (Details) $ in Millions | 3 Months Ended | 
|---|---|
| Jun. 30, 2019  USD ($)  sale  site | |
| Discontinued Operations and Disposal Groups [Abstract] | |
| Number of sales of energy producing assets | sale | 2 | 
| Number of energy producing sites sold | site | 8 | 
| Consideration received | $ | $ 7 | 
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- Definition Number of Energy Producing Sites Sold No definition available. 
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| X | ||||||||||
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- Definition Number of Sales of Energy Producing Assets No definition available. 
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| X | ||||||||||
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- References No definition available. 
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| X | ||||||||||
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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