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Other Liabilities - Long-Term Table (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Other Long-Term Liabilities [Line Items] |  |  |  |  |
Conveyance obligation | $ 0 |  | $ 0 |  | $ 156
Unrecognized tax benefits | 53 |  | 53 |  | 101
Other | 107 |  | 107 |  | 97
Total other long-term liabilities | 160 |  | 160 |  | 354
Other income | 1 | $ 4 | 63 | $ 6 |
Capitalized costs, proved properties | 70,620 |  | 70,620 |  | $ 68,858
ORRI [Member] |  |  |  |  |
Other Long-Term Liabilities [Line Items] |  |  |  |  |
Conveyance obligation | 183 |  | 183 |  |
Consideration |  |  | 199 |  |
Conveyance obligation, noncurrent | 30 |  | 30 |  |
Conveyance obligation, current | 153 |  | 153 |  |
Other income |  |  | 61 |  |
Oil and Gas Properties [Member] | ORRI [Member] |  |  |  |  |
Other Long-Term Liabilities [Line Items] |  |  |  |  |
Capitalized costs, proved properties | $ 77 |  | 77 |  |
Liability [Member] | ORRI [Member] |  |  |  |  |
Other Long-Term Liabilities [Line Items] |  |  |  |  |
Extinguishment of liabilities |  |  | $ 122 |  |

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