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Supplemental Oil and Gas Information (Narrative) (Details) MMBbls in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 $ / bbl $ / Mcf MMcf | Dec. 31, 2017 $ / bbl $ / Mcf ft³ MMBbls | Dec. 31, 2018 bbl | Dec. 31, 2018 ft³ | Dec. 31, 2018 MMBbls | Dec. 31, 2018 $ / Mcf | Dec. 31, 2018 | Dec. 31, 2016 ft³ MMBbls | Dec. 31, 2015 ft³ MMBbls
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proved reserves |  |  | 328.1 |  |  |  | 432.5 | [1] |  |  | 329.0 | 456.2
Future net cash flows annual discount factor, percentage |  |  |  |  |  |  |  |  |  | 10.00% |  |
U.S. statutory rate |  | 21.00% | 35.00% |  |  |  |  |  |  |  |  |
Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reserves attributable to investees accounted for my the equity method | bbl |  |  |  | 0 |  |  |  |  |  |  |  |
Crude Oil And Condensate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reserve estimates, average market price | $ / bbl |  | 65.56 | 51.34 |  |  |  |  |  |  |  |  |
Proved undeveloped reserve development window |  | 5 years |  |  |  |  |  |  |  |  |  |
Natural Gas Liquids [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proved reserves |  |  | 48.9 |  |  |  | 54.2 | [2] |  |  | 42.5 | 36.4
Proved undeveloped reserve development window |  | 5 years |  |  |  |  |  |  |  |  |  |
Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reserve estimates, average market price | $ / Mcf |  | 3.10 | 2.98 |  |  |  |  |  |  |  |  |
Proved reserves | ft³ |  |  | 1,927,100,000,000 |  | 2,143,600,000,000 | [3] |  |  |  |  | 1,878,000,000,000 | 1,688,800,000,000
Proved undeveloped reserve development window |  | 5 years |  |  |  |  |  |  |  |  |  |
Alberta, Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Working interest |  |  |  |  |  |  |  |  |  |  | 5.00% |
Malaysia [Member] | Crude Oil And Condensate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proved reserves |  |  |  |  |  |  | 51.7 |  |  |  |  |
Malaysia [Member] | Natural Gas Liquids [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proved reserves |  |  | 0.3 |  |  |  | 0.7 | [2] |  |  | 0.5 | 0.6
Malaysia [Member] | Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proved reserves |  | 468,200 | 491,400,000,000 |  | 468,200,000,000 | [3] |  |  |  |  | 539,700,000,000 | 546,800,000,000
Malaysia [Member] | Natural Gas [Member] | Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proved reserves | ft³ |  |  |  |  | 26,100 |  |  |  |  |  |  |
Expected sales proceeds | $ / Mcf |  |  |  |  |  |  |  |  | 0.24 |  |  |
Canada [Member] | Natural Gas Liquids [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proved reserves |  |  | 5.6 |  |  |  | 5.9 | [2] |  |  | 5.6 | 0.4
Canada [Member] | Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proved reserves | ft³ |  |  | 1,212,400,000,000 |  | 1,366,400,000,000 | [3] |  |  |  |  | 1,118,900,000,000 | 909,600,000,000
Canada [Member] | Synthetic Oil [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proved reserves | [4] |  |  |  |  |  |  |  |  |  | 0.0 | 114.8
[1] | Includes total proved reserves of 25.5 MMBO for Total and United States attributable to the noncontrolling interest in MP GOM.
[2] | Includes total proved reserves of 1.1 MMBBL for Total and United States attributable to the noncontrolling interest in MP GOM.
[3] | Includes total proved reserves of 10.8 BCF for Total and United States attributable to the noncontrolling interest in MP GOM.
[4] | All synthetic oil operations were sold in June 2016.

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