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Asset Acquisitions, Dispositions and Other - Sale of Assets (Details) - USD ($) $ in Millions | 1 Months Ended
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Mar. 31, 2016 | Jan. 31, 2016
Occidental Tower Building, Dallas Texas |  |
Acquisitions, dispositions and other transactions |  |
Proceeds from sale of building |  | $ 85
Pre-tax gain on sale of building |  | $ 57
Piceance operations |  |
Acquisitions, dispositions and other transactions |  |
Sale of equity investment, net | $ 153 |
Gain (loss) on sale | $ 121 |

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