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Asset Impairments (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 12, 2016 | Mar. 01, 2016 | Nov. 30, 2014 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jul. 14, 2017
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Construction in progress |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  | $ 1,709,000,000 | $ 702,000,000 | $ 4,860,000,000 |
Other impairment losses |  |  |  |  |  |  |  |  |  |  | 48,000,000 |  |
Impairment losses on investments |  |  |  |  |  |  |  |  | $ 56,000,000 | $ 79,000,000 | 268,000,000 | 56,000,000 |
Elbow Creek |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  | $ 117,000,000 |  |  |  |  |  |
Goat Wind |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  | 60,000,000 |  |  |  |  |  |
Forward |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |
Long Beach |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  | 36,000,000 |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  | 153,000,000 |  |
Emission Allowances |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  | 23,000,000 |  |
Other Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  | 23,000,000 |  |
Solar Panels |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  | 19,000,000 |  |
Deferred Marketing Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  | 18,000,000 |  |
Limestone |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  | 1,514,000,000 |  |  |  |
W.A. Parish |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  | 1,295,000,000 |  |  |  |
Huntley |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  |  | 132,000,000 |
Term of agreement |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Dunkirk |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  |  | 160,000,000 |
Term of agreement |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Gregory Power Partners, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  |  | $ 176,000,000 |
Rockford |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  | 17,000,000 |  |
Percentage of ownership interest | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale | $ 55,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Renewables |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  | $ 15,000,000 | $ 14,000,000 | 22,000,000 |  |  |  |  |  |  |
Collectibility of Receivables | BTEC New Albany, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, receivable |  |  |  |  |  |  |  |  |  |  |  |  | $ 48,000,000
Collectibility of Receivables | BTEC New Albany, LLC | Purchaser Incurred Costs |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, receivable |  |  |  |  |  |  |  |  |  |  |  |  | 38,000,000
Collectibility of Receivables | BTEC New Albany, LLC | Liquidation Damages |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, receivable |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000
Construction in Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | $ 41,000,000 |  |  |  |  |  |  |
South Texas Project |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss investments |  |  |  | 1,248,000,000 |  |  |  |  |  |  |  |  |
Indian River |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss investments |  |  |  | 36,000,000 |  |  |  |  |  |  |  |  |
Keystone |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss investments |  |  |  | 35,000,000 |  |  |  |  |  |  |  |  |
Conemaugh |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss investments |  |  |  | 35,000,000 |  |  |  |  |  |  |  |  |
Langford |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss investments |  |  |  | 110,000,000 |  |  |  |  |  |  |  |  |
Elbow Creek |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss investments |  |  |  | 26,000,000 |  |  |  |  |  |  |  |  |
Forward |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss investments |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |
Petra Nova Parish Holdings |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss investments |  |  |  | $ 69,000,000 |  |  |  | $ 140,000,000 |  |  |  |  |
Ownership percentage |  |  |  | 50.00% |  |  |  | 50.00% |  | 50.00% |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss investments |  |  |  | $ 11,000,000 |  |  |  |  |  |  | $ 22,000,000 |  |
Community Wind North, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss investments |  |  |  |  |  |  | 36,000,000 |  |  |  |  |  |
Sherbino I Wind Farm LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss investments |  |  |  |  |  |  | $ 70,000,000 |  |  |  |  |  |
Solar Panels |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  | $ 29,000,000 |  |  |  |

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