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Business Segments (Segment Information) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ (286,800,000) | $ (65,900,000) | $ (17,600,000) | $ 58,500,000 | $ (63,900,000) | $ (16,200,000) | $ 2,900,000 | $ (198,800,000) | $ (311,789,000) |  | $ (275,970,000) | [1] | $ (2,270,833,000) | [1]
Revenues from external customers |  |  |  |  |  |  |  |  |  | 2,225,129,000 |  | 1,811,238,000 | [1] | 2,941,271,000 | [1]
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  | 181,783,000 |  | 148,170,000 | [1] | 117,375,000 | [1]
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 382,738,000 |  | (219,172,000) | [1] | (1,026,490,000) | [1]
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 957,719,000 |  | 1,054,081,000 | [1] | 1,619,824,000 | [1]
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  |  | 42,590,000 |  | 46,742,000 | [1] | 48,665,000 | [1]
Amortization of undeveloped leases |  |  |  |  |  |  |  |  |  | 61,776,000 |  | 43,417,000 |  | 75,312,000 |
Impairment of assets |  |  |  |  |  |  |  |  |  | 0 |  | 95,088,000 | [1] | 2,493,156,000 | [1]
Total assets at year end |  | 9,860,942,000 |  |  |  | 10,295,860,000 |  |  |  | 9,860,942,000 |  | 10,295,860,000 |  |  |
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 958,300,000 |  | 692,300,000 |  | 1,260,200,000 |
Impairment of assets | [2] |  |  |  |  |  |  |  |  |  |  |  |  | 329,000,000 |
Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 485,700,000 |  | 365,300,000 |  | 549,700,000 |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  | 95,088,000 |  | 683,574,000 |
Malaysia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 781,100,000 |  | 753,400,000 |  | 1,131,400,000 |
Impairment of assets | [2] |  |  |  |  |  |  |  |  |  |  |  |  | 1,480,600,000 |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | (900,000) |  | (2,000,000) |  | (15,000,000) |
Total assets at year end |  | 22,900,000 |  |  |  | 27,100,000 |  |  |  | 22,900,000 |  | 27,100,000 |  | 38,300,000 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | (311,800,000) |  | (276,000,000) |  | (2,270,800,000) |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 2,225,100,000 |  | 1,811,200,000 |  | 2,941,300,000 |
Interest income |  |  |  |  |  |  |  |  |  | 7,400,000 |  | 2,900,000 |  | 4,000,000 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  | 181,800,000 |  | 148,200,000 |  | 117,400,000 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 382,700,000 |  | (219,200,000) |  | (1,026,500,000) |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 957,700,000 |  | 1,054,100,000 |  | 1,619,800,000 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  |  | 42,600,000 |  | 46,700,000 |  | 48,700,000 |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  |  | 61,800,000 |  | 43,400,000 |  | 75,400,000 |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  | 95,100,000 |  | 2,493,200,000 |
Deferred and noncurrent income taxes |  |  |  |  |  |  |  |  |  | 260,400,000 |  | (387,800,000) |  | (978,000,000) |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  |  | 870,800,000 |  | 753,100,000 |  | 1,791,500,000 |
Total assets at year end |  | 9,860,900,000 |  |  |  | 10,295,900,000 |  |  |  | 9,860,900,000 |  | 10,295,900,000 |  | 11,493,800,000 |
Exploration and production [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 296,600,000 |  | (124,900,000) |  | (2,010,900,000) |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 2,220,500,000 | [3] | 1,804,600,000 |  | 2,934,700,000 |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 137,100,000 |  | (155,100,000) |  | (1,111,000,000) |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 939,900,000 |  | 1,037,300,000 |  | 1,607,900,000 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  |  | 42,600,000 |  | 46,700,000 |  | 48,700,000 |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  |  | 61,800,000 |  | 43,400,000 |  | 75,400,000 |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  | 95,100,000 |  | 2,493,200,000 |
Deferred and noncurrent income taxes |  |  |  |  |  |  |  |  |  | 17,900,000 |  | (311,000,000) |  | (917,500,000) |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  |  | 856,000,000 |  | 731,200,000 |  | 1,731,600,000 |
Total assets at year end |  | 8,736,300,000 |  |  |  | 9,118,900,000 |  |  |  | 8,736,300,000 |  | 9,118,900,000 |  | 10,863,300,000 |
Exploration and production [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | (2,600,000) |  | (205,400,000) |  | (615,700,000) |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 953,900,000 | [3] | 685,700,000 |  | 1,253,600,000 |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 2,500,000 |  | (87,900,000) |  | (337,000,000) |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 546,100,000 |  | 600,500,000 |  | 794,900,000 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  |  | 17,400,000 |  | 17,100,000 |  | 20,200,000 |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  |  | 60,200,000 |  | 38,400,000 |  | 59,200,000 |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 329,000,000 |
Deferred and noncurrent income taxes |  |  |  |  |  |  |  |  |  | 2,500,000 |  | (108,400,000) |  | (187,700,000) |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  |  | 534,800,000 |  | 269,800,000 |  | 1,263,100,000 |
Total assets at year end |  | 5,186,200,000 |  |  |  | 5,419,000,000 |  |  |  | 5,186,200,000 |  | 5,419,000,000 |  | 5,717,800,000 |
Exploration and production [Member] | Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | [4] |  |  |  |  |  |  |  |  | 112,500,000 |  | (35,900,000) |  | (583,400,000) |
Revenues from external customers | [4] |  |  |  |  |  |  |  |  | 485,500,000 | [3] | 365,300,000 |  | 549,700,000 |
Interest income | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net of capitalization | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) | [4] |  |  |  |  |  |  |  |  | 44,400,000 |  | (134,300,000) |  | (188,800,000) |
Depreciation, depletion and amortization | [4] |  |  |  |  |  |  |  |  | 185,400,000 |  | 203,200,000 |  | 261,900,000 |
Accretion of asset retirement obligations | [4] |  |  |  |  |  |  |  |  | 7,900,000 |  | 13,300,000 |  | 12,600,000 |
Amortization of undeveloped leases | [4] |  |  |  |  |  |  |  |  | 1,600,000 |  | 4,500,000 |  | 14,400,000 |
Impairment of assets | [4] |  |  |  |  |  |  |  |  |  |  | 95,100,000 |  | 683,600,000 |
Deferred and noncurrent income taxes | [4] |  |  |  |  |  |  |  |  | 55,300,000 |  | (175,800,000) |  | (146,000,000) |
Additions to property, plant, equipment | [4] |  |  |  |  |  |  |  |  | 267,600,000 |  | 361,300,000 |  | 184,900,000 |
Total assets at year end | [4] | 1,725,800,000 |  |  |  | 1,559,500,000 |  |  |  | 1,725,800,000 |  | 1,559,500,000 |  | 2,460,600,000 |
Exploration and production [Member] | Malaysia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 224,200,000 |  | 171,100,000 |  | (653,200,000) |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 781,100,000 | [3] | 753,400,000 |  | 1,131,400,000 |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 126,400,000 |  | 85,900,000 |  | (567,900,000) |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 204,600,000 |  | 227,700,000 |  | 544,900,000 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  |  | 17,300,000 |  | 16,300,000 |  | 15,900,000 |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,480,600,000 |
Deferred and noncurrent income taxes |  |  |  |  |  |  |  |  |  | (3,700,000) |  | (8,500,000) |  | (579,200,000) |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  |  | 16,000,000 |  | 101,400,000 |  | 244,400,000 |
Total assets at year end |  | 1,670,100,000 |  |  |  | 2,024,700,000 |  |  |  | 1,670,100,000 |  | 2,024,700,000 |  | 2,537,200,000 |
Exploration and production [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | (37,500,000) |  | (54,700,000) |  | (158,600,000) |
Revenues from external customers |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (36,200,000) |  | (18,800,000) |  | (17,300,000) |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 3,800,000 |  | 5,900,000 |  | 6,200,000 |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  | 1,800,000 |
Deferred and noncurrent income taxes |  |  |  |  |  |  |  |  |  | (36,200,000) |  | (18,300,000) |  | (4,600,000) |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  |  | 37,600,000 |  | (1,300,000) |  | 39,200,000 |
Total assets at year end |  | 154,200,000 |  |  |  | 115,700,000 |  |  |  | 154,200,000 |  | 115,700,000 |  | 147,700,000 |
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | (607,500,000) |  | (149,100,000) |  | (244,900,000) |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 4,600,000 |  | 6,600,000 |  | 6,600,000 |
Interest income |  |  |  |  |  |  |  |  |  | 7,400,000 |  | 2,900,000 |  | 4,000,000 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  | 181,800,000 |  | 148,200,000 |  | 117,400,000 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 245,600,000 |  | (64,100,000) |  | 84,500,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 17,800,000 |  | 16,800,000 |  | 11,900,000 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |
Deferred and noncurrent income taxes |  |  |  |  |  |  |  |  |  | 242,500,000 |  | (76,800,000) |  | (60,500,000) |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  |  | 14,800,000 |  | 21,900,000 |  | 59,900,000 |
Total assets at year end |  | $ 1,101,700,000 |  |  |  | $ 1,149,900,000 |  |  |  | $ 1,101,700,000 |  | $ 1,149,900,000 |  | $ 592,200,000 |
[1] | Reclassified to conform to current presentation (see Note A).
[2] | Results exclude corporate overhead, interest and discontinued operations.
[3] | Includes a pretax gain of $129.0 million on sale of Seal area heavy oil field sold in January 2017.
[4] | Includes Synthetic crude operations in 2016 and 2015. This business was sold in June 2016.

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- Definition The expense charged against earnings for the periodic recognition of capitalized leases. This element may apply to energy companies that lease mineral producing properties and to other enterprises that capitalize property, plant, or equipment obtained through capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45031-112735 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of deferred income tax expense (benefit) and income tax credits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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