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Supplemental Oil and Gas Information (Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |
Future cash inflows | [1] | $ 34,423.0 | $ 21,992.1 | $ 17,549.3 |
Future development costs | [1] | (5,159.2) | (3,793.5) | (3,598.5) |
Future production costs | [1] | (12,785.9) | (9,577.7) | (8,972.5) |
Future income taxes | [1] | (2,924.9) | (1,287.0) | (273.5) |
Future net cash flows | [1] | 13,553.0 | 7,333.9 | 4,704.8 |
10% annual discount for estimated timing of cash flows | [1] | (5,273.1) | (3,411.0) | (2,124.8) |
Standardized measure of discounted future net cash flows | [1] | 8,279.9 | 3,922.9 | 2,580.0 | $ 3,859.1
United States [Member] |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |
Future cash inflows | [1] | 23,473.9 | 12,885.8 | 9,477.9 |
Future development costs | [1] | (3,279.1) | (2,079.5) | (1,691.1) |
Future production costs | [1] | (7,279.5) | (4,765.3) | (3,981.6) |
Future income taxes | [1] | (2,216.5) | (893.7) | (118.9) |
Future net cash flows | [1] | 10,698.8 | 5,147.3 | 3,686.3 |
10% annual discount for estimated timing of cash flows | [1] | (4,295.4) | (2,698.2) | (1,799.5) |
Standardized measure of discounted future net cash flows | [1] | 6,403.4 | 2,449.1 | 1,886.8 |
Canada [Member] |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |
Future cash inflows | [1] | 5,437.5 | 4,714.3 | 3,752.7 |
Future development costs | [1] | (1,362.7) | (1,081.7) | (1,143.6) |
Future production costs | [1] | (2,693.0) | (2,507.4) | (2,329.7) |
Future income taxes | [1] | (236.4) | (161.1) | (81.3) |
Future net cash flows | [1] | 1,145.4 | 964.1 | 198.1 |
10% annual discount for estimated timing of cash flows | [1] | (531.4) | (394.6) | (95.0) |
Standardized measure of discounted future net cash flows | [1] | 614.0 | 569.5 | 103.1 |
Malaysia [Member] |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |
Future cash inflows | [1] | 5,511.6 | 4,392.0 | 4,318.7 |
Future development costs | [1] | (517.4) | (632.3) | (763.8) |
Future production costs | [1] | (2,813.4) | (2,305.0) | (2,661.2) |
Future income taxes | [1] | (472.0) | (232.2) | (73.3) |
Future net cash flows | [1] | 1,708.8 | 1,222.5 | 820.4 |
10% annual discount for estimated timing of cash flows | [1] | (446.3) | (318.2) | (230.3) |
Standardized measure of discounted future net cash flows | [1] | $ 1,262.5 | $ 904.3 | $ 590.1 |
[1] | 2018 includes noncontrolling interest in MP GOM.

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- Definition Amount of estimated future accumulated cash inflow from the sale of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62424-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62455-109447 + Details
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- Definition Amount of estimated future accumulated cash outflow for costs to be incurred in developing proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62424-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62455-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447 + Details
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- Definition Amount of estimated future accumulated cash outflow for income tax, based on the future income less future expense derived from production and sale of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62424-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62455-109447 + Details
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- Definition Amount, after future accumulated cash outflow for development and production costs and future income tax, of estimated future accumulated cash inflow from the sale of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62424-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62455-109447 + Details
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