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Fair Value (Nonrecurring Measurements) (Details) - USD ($) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 8 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 09, 2015 | Feb. 28, 2014 | Sep. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Mar. 31, 2014 | Jun. 06, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Aug. 28, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 25, 2014
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Nonoperating Expense |  |  |  | $ 0 |  | $ 16,000,000 |  |  |  |  |  | $ 0 | $ 60,000,000 |
Impairment expenses |  |  |  |  |  |  |  |  |  |  |  | 276,000,000 | 304,000,000 |
Goodwill impairment expense |  |  |  | 0 |  | 0 |  |  |  |  |  | 0 | 154,000,000 |
East Bend DPL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |
Ebute [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring |  |  |  |  |  | 36,000,000 |  |  |  | $ 47,000,000 |  |  | 36,000,000 |
UK Wind (Newfield) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 |
DPLER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment expense |  |  |  |  |  |  | 136,000,000 |  |  |  |  |  |  |
Buffalo Gap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment expense |  |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |
Kilroot [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring |  |  |  | 78,000,000 |  |  |  |  |  |  |  | 78,000,000 |  |
buffalo gap III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring |  |  |  | 116,000,000 |  |  |  |  |  |  |  | 116,000,000 |  |
UK Wind Development Projects [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |
Long Lived Assets Held And Used [Member] | East Bend DPL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment expenses | [1] |  |  |  |  |  | 12,000,000 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Ebute [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment expenses | [1] |  |  |  |  |  |  |  |  | 52,000,000 |  |  | 15,000,000 |
Long Lived Assets Held And Used [Member] | UK Wind (Newfield) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment expenses | [1] |  |  |  |  |  |  | $ 11,000,000 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Kilroot [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Nonoperating Expense | [1] |  |  |  |  |  |  |  |  |  | $ 113,000,000 |  |  |
Long Lived Assets Held And Used [Member] | buffalo gap III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Nonoperating Expense | [1] |  |  |  |  |  |  |  |  |  |  | 118,000,000 |  |
Long Lived Assets Held And Used [Member] | Other Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Nonoperating Expense | [1] |  |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | UK Wind Development Projects [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Nonoperating Expense | [1] |  |  |  |  |  |  |  | 37,000,000 |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | East Bend DPL [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  |  | 0 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | East Bend DPL [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | East Bend DPL [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  |  | 0 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Ebute [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  | 0 |  |  |  | 0 |  |  | 0 |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Ebute [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  | 0 |  |  |  | 0 |  |  | 0 |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Ebute [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  | 36,000,000 |  |  |  | 47,000,000 |  |  | 36,000,000 |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | UK Wind (Newfield) [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  |  |  | 0 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | UK Wind (Newfield) [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  |  |  | 0 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | UK Wind (Newfield) [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  |  |  | 0 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Kilroot [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Kilroot [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | buffalo gap III [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  | 0 |  |  |  |  |  |  |  | 0 |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | buffalo gap III [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  | 0 |  |  |  |  |  |  |  | 0 |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Affiliates [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  | 0 |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Affiliates [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  | 21,000,000 |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Affiliates [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  | 0 |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | UK Wind Development Projects [Domain] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  |  |  |  | 0 |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | UK Wind Development Projects [Domain] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | UK Wind Development Projects [Domain] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] |  |  |  |  |  |  |  | 0 |  |  |  |  |
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | East Bend DPL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  |  |  |  |  | 14,000,000 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Ebute [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  |  |  |  | $ 51,000,000 |  |  |  | 99,000,000 |  |  | $ 51,000,000 |
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | UK Wind (Newfield) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  |  |  |  |  |  | $ 11,000,000 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Kilroot [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  |  |  |  |  |  |  |  |  | 191,000,000 |  |  |
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | buffalo gap III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  |  | 234,000,000 |  |  |  |  |  |  |  | 234,000,000 |  |
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Other Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  |  |  | $ 29,000,000 |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | UK Wind Development Projects [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  |  |  |  |  |  |  | $ 38,000,000 |  |  |  |  |
Goodwill [Member] | DPLER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment expense | [3] |  | $ 136,000,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill [Member] | Buffalo Gap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment expense | [3] |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |
Goodwill [Member] | Fair Value [Member] | DPLER [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [3] |  | 0 |  |  |  |  |  |  |  |  |  |  |
Goodwill [Member] | Fair Value [Member] | DPLER [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [3] |  | 0 |  |  |  |  |  |  |  |  |  |  |
Goodwill [Member] | Fair Value [Member] | DPLER [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [3] |  | 0 |  |  |  |  |  |  |  |  |  |  |
Goodwill [Member] | Fair Value [Member] | Buffalo Gap [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [3] |  |  |  |  |  | 0 |  |  |  |  |  |  |
Goodwill [Member] | Fair Value [Member] | Buffalo Gap [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [3] |  |  |  |  |  | 0 |  |  |  |  |  |  |
Goodwill [Member] | Fair Value [Member] | Buffalo Gap [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [3] |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |
Goodwill [Member] | Carrying Amount [Member] | DPLER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [2],[3] |  | $ 136,000,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill [Member] | Carrying Amount [Member] | Buffalo Gap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [2],[3] |  |  |  |  |  | 28,000,000 |  |  |  |  |  |  |
Equity Method Investments [Member] | Silver Ridge Power [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Nonoperating Expense | [4] |  |  |  |  |  |  |  |  | 42,000,000 |  |  |  |
Equity Method Investments [Member] | Entek [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Nonoperating Expense | [4] |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,000,000
Equity Method Investments [Member] | Solar Spain [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Nonoperating Expense |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Member] | Fair Value [Member] | Silver Ridge Power [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [4] |  |  |  |  |  |  |  |  | 0 |  |  |  |
Equity Method Investments [Member] | Fair Value [Member] | Silver Ridge Power [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Fair Value, Nonrecurring | [4] |  |  |  |  |  |  |  |  | 273,000,000 |  |  |  |
Equity Method Investments [Member] | Fair Value [Member] | Entek [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Fair Value, Nonrecurring | [4] |  |  |  |  |  |  |  |  |  |  |  |  | 125,000,000
Equity Method Investments [Member] | Fair Value [Member] | Entek [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring |  | 29,000,000 |  | 29,000,000 |  |  |  |  |  |  |  | $ 29,000,000 |  |
Equity Method Investments [Member] | Carrying Amount [Member] | Silver Ridge Power [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [2],[4] |  |  |  |  |  |  |  |  | $ 315,000,000 |  |  |  |
Equity Method Investments [Member] | Carrying Amount [Member] | Entek [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [2],[4] |  |  |  |  |  |  |  |  |  |  |  |  | $ 143,000,000
Equity Method Investments [Member] | Carrying Amount [Member] | Solar Spain [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Cameroon [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Impairment expenses | [4] |  |  |  |  |  | 38,000,000 |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Fair Value [Member] | Cameroon [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Fair Value, Nonrecurring | [4] |  |  |  |  |  | 334,000,000 |  |  |  |  |  |  |
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Fair Value, Nonrecurring | [2],[4] |  |  |  |  |  | $ 372,000,000 |  |  |  |  |  |  |
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Fair Value Inputs, Long-term Revenue Growth Rate |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  |  |  |  |  |  |  |  |  |  | 24.00% |  |
Fair Value Inputs, Discount Rate |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |
Income Approach Valuation Technique [Member] | Equity Method Investments [Member] | Maximum [Member] | Solar Spain [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  |  |  |  |  |  |  |  |  |  | 56.00% |  |
Fair Value Inputs, Discount Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Fair Value Inputs, Long-term Revenue Growth Rate |  |  |  |  |  |  |  |  |  |  |  | (3.00%) |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  |  |  |  |  |  |  |  |  |  | (13.00%) |  |
Fair Value Inputs, Discount Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Kilroot [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |
Fair Value Inputs, Discount Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Maximum [Member] | buffalo gap III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  |  |  |  |  |  |  |  |  |  |  | 19.00% |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  |  |  |  |  |  |  |  |  |  | 58.00% |  |
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] | Kilroot [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  |  |  |  |  |  |  |  |  |  |  | (88.00%) |  |
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Fair Value Inputs, Discount Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] | buffalo gap III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  |  |  |  |  |  |  |  |  |  |  | (2.00%) |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  |  |  |  |  |  |  |  |  |  | (282.00%) |  |
[1] | See Note 15—Asset Impairment Expense for further information.
[2] | (1) Represents the carrying values at the dates of measurement, before fair value adjustment.
[3] | See Note 14—Goodwill Impairment for further information.
[4] | See Note 18—Discontinued Operations for further information.

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