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Property, Plant and Equipment (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 01, 2017 | Dec. 31, 2014
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of property, plant and equipment |  |  |  | $ 69,506,000 |  | $ 1,155,144,000 |  | $ 423,911,000 |  |  |
Asset retirement obligation settled |  |  |  | 29,111,000 |  | 20,589,000 |  |  |  |  |
Gain (loss) on sale of assets |  |  |  | 127,434,000 |  | 1,663,000 | [1] | 154,155,000 | [1] |  |
Total capitalized exploratory well costs |  |  | $ 175,640,000 | 175,640,000 |  | 148,500,000 |  | 130,514,000 |  |  | $ 120,455,000
Cost of acquired assets |  |  |  | 71,100,000 |  | 225,300,000 |  | 12,600,000 |  |  |
Impairment of assets |  |  |  | 0 |  | 95,088,000 | [1] | 2,493,156,000 | [1] |  |
Redetermination expense |  |  |  | 15,000,000 | [2] | 39,100,000 | [1] |  |  |  |
Exploratory well costs capitalized more than one year |  |  | 134,100,000 | 134,100,000 |  |  |  |  |  |  |
Athabasca Oil Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of acquired assets, cash paid |  |  |  |  |  | 206,700,000 |  |  |  |  |
Athabasca Oil Corporation [Member] | Canadian Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of acquired assets |  |  |  |  |  | 375,000,000 |  |  |  |  |
Western Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of property, plant and equipment |  | $ 48,800,000 |  |  |  |  |  |  |  |  |
Asset retirement obligation settled |  | $ 85,900,000 |  |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  | 129,000,000 |  |  |  |  |  |  |
Eagle Ford Shale [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of property, plant and equipment |  |  |  | 19,600,000 |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  | 0 |  |  |  |  |  |  |
Syncrude [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of property, plant and equipment |  |  |  |  |  | 739,100,000 |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  | $ 71,700,000 |  |  |  |  |
Syncrude [Member] | Canadian Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of interest in oil and gas property sold during period |  |  |  |  |  | 5.00% |  |  |  |  |
Montney Natural Gas Fields [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of property, plant and equipment |  |  |  |  |  | $ 414,100,000 |  |  |  |  |
Gain (loss) on sale of assets |  |  |  | 7,100,000 |  | 5,100,000 |  |  |  |  |
Deferred gain on sale of property |  |  | 181,700,000 | $ 181,700,000 |  | 187,000,000 |  |  |  |  |
Deferred gain, period of recognition |  |  |  | 18 years |  |  |  |  |  |  |
Kaybob Duvernay Lands, Alberta [Member] | Athabasca Oil Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of acquired assets, carried interest |  |  |  |  |  | $ 168,000,000 |  |  |  |  |
Carried interest paid |  |  | $ 44,800,000 | $ 44,800,000 |  |  |  |  |  |  |
Cost of acquired assets, interest carry period |  |  |  | 5 years |  |  |  |  |  |  |
Kaybob Duvernay Lands, Alberta [Member] | Athabasca Oil Corporation [Member] | Canadian Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest in assets acquired |  |  |  |  |  | 70.00% |  |  |  |  |
Placid Montney Lands, Alberta [Member] | Athabasca Oil Corporation [Member] | Canadian Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest in assets acquired |  |  |  |  |  | 30.00% |  |  |  |  |
Kakap Field Block K Malaysia [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Working interest |  |  | 6.35% | 6.35% |  |  |  |  |  | 6.67% |
Redetermination expense |  |  | $ 15,000,000 |  |  | $ 39,100,000 |  |  |  |  |
Redetermination expense, net of tax |  |  | 9,300,000 |  |  | 24,100,000 |  |  |  |  |
Malaysia [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of assets | [2] |  |  |  |  |  |  | $ 1,480,600,000 |  |  |
Redetermination expense | [2] |  |  | $ 15,000,000 |  | $ 39,100,000 |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | 20,500,000 | 20,500,000 |  |  |  |  |  |  |
Brunei [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | 70,400,000 | 70,400,000 |  |  |  |  |  |  |
Vietnam [Member] |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | $ 43,200,000 | $ 43,200,000 |  |  |  |  |  |  |
[1] | Reclassified to conform to current presentation (see Note A).
[2] | Results exclude corporate overhead, interest and discontinued operations.

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