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Dispositions Dispositions (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 02, 2017 | Apr. 07, 2017 | Jan. 27, 2016 | Jan. 01, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  | $ 2 | $ 79 |  |  | $ 260 | $ 473
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  | 622 |  |  |  | 622 |
Proceeds from the sale of businesses, net of cash sold, and equity method investments |  |  |  |  |  |  |  |  | 39 | 157
Gain (Loss) on Disposition of Business |  |  |  |  | 1 | 0 |  |  | 49 | (30)
Proceeds from sale of ownership interest |  |  |  |  |  |  |  |  | 0 | (134)
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Kazakhstan [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of businesses, net of cash sold, and equity method investments |  | $ 24 |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  | $ 49 |  |  |  |  |  |  |  |
Pre-tax income of disposed businesses, Excluding gain on disposal, included in continuing operations |  |  |  |  | 0 | (2) |  |  | 13 | 5
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Kazakhstan Hydro [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Pre-tax income of disposed businesses, Excluding gain on disposal, included in continuing operations |  |  |  |  | 12 | 10 |  |  | 33 | 28
UK Wind Projects [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  | $ 20 |  |  |
Kazakhstan [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  | $ 0 | 0 |  |  | $ 94 | $ 0
DPLER [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of businesses, net of cash sold, and equity method investments |  |  |  | $ 76 |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  | $ (49) |  |  |  |  |  |
Kelanitissa [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of businesses, net of cash sold, and equity method investments |  |  | $ 18 |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  | $ 5 |  |  |  |  |  |  |
Subsequent Event [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Kazakhstan Hydro [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business | $ (37) |  |  |  |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold | 100.00% |  |  |  |  |  |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  | $ 23 |  | $ 49 |  |

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