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Dispositions Dispositions (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 21, 2017 | Apr. 07, 2017 | Jan. 27, 2016 | Jan. 01, 2016 | Mar. 31, 2017 | Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  | $ 168 | $ 159
Proceeds from the sale of businesses, net of cash sold, and equity method investments |  |  |  |  | 4 | 115
Gain (Loss) on Disposition of Business |  |  |  |  | 0 | (47)
Proceeds from sale of ownership interest |  |  |  |  | 0 | (134)
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Kazakhstan [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Pre-tax loss of disposed businesses, Excluding gain on disposal, included in continuing operations |  |  |  |  | 81 |
Pre-tax income of disposed businesses, Excluding gain on disposal, included in continuing operations |  |  |  |  |  | 8
Kazakhstan [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  | 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 |  |  |
Long Lived Assets Held And Used [Member] | Kazakhstan [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  | 92 |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | 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 |  |  |  |  | 94 |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  | 171 |
Fair Value Less Costs To Sell |  |  |  |  | $ 29 |
Subsequent Event [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 | $ 50 |  |  |  |  |
Subsequent Event [Member] | Disposal Group, Held-for-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 |  | $ 48 |  |  |  |

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