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Supplemental Oil and Gas Information - Narrative (Details) MMBbls in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 $ / bbl $ / Mcf MMBbls ft³ | Dec. 31, 2018 $ / bbl $ / Mcf MMBbls ft³ | Dec. 31, 2017 MMBbls ft³ | Dec. 31, 2016 MMBbls ft³
Reserve Quantities [Line Items] |  |  |  |
Future net cash flows annual discount factor, percentage | 10.00% |  |  |
U.S. statutory rate |  | 21.00% | 35.00% |
Equity Method Investee |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Reserves attributable to investees accounted for my the equity method | 0 |  |  |
Net crude oil and condensate revenue |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Average production costs per barrel of oil (in dollars per barrel) | $ / bbl | 55.69 | 65.56 |  |
Proved undeveloped reserve development window |  | 5 years | 5 years |
Associated assets, percentage interests acquired | 80.00% |  |  |
Net natural gas liquids revenue |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Proved reserves | MMBbls | 56.1 | 54.2 | 48.9 | 42.5
Proved undeveloped reserve development window | 5 years |  | 5 years |
Associated assets, percentage interests acquired | 80.00% |  |  |
Net natural gas revenue |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Average production costs per volume of natural gas (in dollars per cubic foot) | $ / Mcf | 2.57 | 3.10 |  |
Proved reserves | 2,069,700,000,000 | 2,143,600,000,000 | 1,927,100,000,000 | 1,878,000,000,000.0
Proved undeveloped reserve development window | 5 years |  |  |
Associated assets, percentage interests acquired | 80.00% |  |  |
Malaysia & Other | Net natural gas liquids revenue |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Proved reserves | MMBbls | 0.0 | 0.7 | 0.3 | 0.5
Malaysia & Other | Net natural gas revenue |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Proved reserves | 0 | 468,200,000,000 | 491,400,000,000 | 539,700,000,000
Canada | Net natural gas liquids revenue |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Proved reserves | MMBbls | 3.3 | 5.9 | 5.6 | 5.6
Canada | Net natural gas revenue |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Proved reserves | 1,652,900,000,000 | 1,366,400,000,000 | 1,212,400,000,000 | 1,118,900,000,000

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