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Goodwill And Other Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2015
Power [Member] |
Goodwill [Line Items] |
Expenses Related To Emissions And Renewable Energy Requirements | Such expenses for the years ended December 31, 2015, 2014 and 2013 were as follows:
|  |  | Years Ended December 31, |
|  |  | 2015 |  | 2014 |  | 2013 |
|  |  | Millions |
| Emissions Expense |  | $ | 13 |  |  | $ | 10 |  |  | $ | 6 |  |
| Renewable Energy Expense |  | $ | 91 |  |  | $ | 59 |  |  | $ | 26 |  |

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- Definition Schedule of Expenses Related to Emissions and Renewable Energy Requirements [Table Text Block] + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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