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Acquisitions and Dispositions - Dispositions and Divestitures (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) asset | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Dispositions |  |  |  |  |
Recognized gains/(losses) related to sale of assets, net |  |  |  | $ (2) | $ 1
Assets classified as held for sale |  |  |  | 0 |
Proceeds from sales of assets |  |  | $ 654 | $ 5 | $ 28
Disposed of by sale | Depreciation and amortization |  |  |  |  |
Dispositions |  |  |  |  |
Recognized gains/(losses) related to sale of assets, net |  |  | 100 |  |
Recognized gains related to sale of assets |  |  | 158 |  |
Recognized losses related to sales of assets |  |  | 58 |  |
Held for sale | Goodwill | Depreciation and amortization |  |  |  |  |
Dispositions |  |  |  |  |
Impairment losses |  |  | 15 |  |
Forecast | Disposed of by sale |  |  |  |  |
Dispositions |  |  |  |  |
Proceeds from sales of assets | $ 70 | $ 310 |  |  |
Number of non-core assets sold | asset |  | 2 |  |  |
Other current assets | Held for sale |  |  |  |  |
Dispositions |  |  |  |  |
Assets classified as held for sale |  |  | $ 275 |  |

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