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Contingencies and Commitments (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Feb. 28, 2017 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2018 | Apr. 13, 2018 | Dec. 31, 2017 | Dec. 01, 2017
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Loss Contingency, Settlement Agreement, Terms |  |  |  |  |  |  | 30 years |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  | $ 275,000,000 |  | $ 275,000,000 |  |  |
Burlington Resources Inc Vs The Republic Of Ecuador [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Cash Proceeds from Legal Settlements |  |  |  |  |  | $ 262,000,000 |  |  |  |
Conoco Phillips Vs Petroleos de Venezuela SA [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount Awarded from Other Party |  |  | $ 2,000,000,000 |  |  |  |  |  |  |
Initial Litigation Settlement Amount Awarded From Other Party |  | $ 1,930,000,000 |  |  |  |  |  |  |  |
Total Proceeds From Legal Settlement |  |  |  |  | 345,000,000 |  |  |  |  |
Cash Proceeds from Legal Settlements |  |  |  |  | 103,000,000 |  |  |  |  |
Inventory Received For Settlement |  |  |  |  | 242,000,000 |  |  |  |  |
Initial Settlement Agreement Payment Terms |  |  |  |  |  |  | 90 days from the timing of signing |  |  |
Remaining Settlement Agreement Payment Terms |  |  |  |  |  |  | paid quarterly over a period of four and a half years |  |  |
Initial Payment received related to legal settlement | $ 500,000,000 |  |  |  |  |  |  |  |  |
ECUADOR | Burlington Resources Inc Vs The Republic Of Ecuador [Member] | Burlington Resources, Inc [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation Settlement Amount Awarded To Other Party |  |  |  | $ 380,000,000 |  |  |  |  |  |
Litigation Settlement, Amount Awarded from Other Party |  |  |  | 42,000,000 |  |  |  |  |  |
Settlement Amount Awarded To Other Party Through Third Party |  |  |  |  |  |  |  |  | $ 337,000,000 |
Settlement Amount Received By Other Party |  |  |  |  |  |  |  | $ 262,000,000 |  | $ 75,000,000
Offset For Counter Claim |  |  |  | $ 24,000,000 |  |  |  |  |  |
U.S. and Canada | Cleanup Remediation Activities [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Total environmental accrual included in balance sheet |  |  |  |  | $ 170,000,000 |  | $ 170,000,000 |  | $ 180,000,000 |

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