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Divestitures - Dispositions and Divestitures (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
May 01, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Dispositions |  |  |
Proceeds from sales of assets |  | $ 83 | $ 161
Held for sale | Other current assets |  |  |
Dispositions |  |  |
Assets classified as held for sale |  | $ 150 |
Subsequent event |  |  |
Dispositions |  |  |
Proceeds from sales of assets | $ 255 |  |

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