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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | $ 21,992.1 | $ 17,549.3 | $ 27,439.0 |
Future development costs | (3,793.5) | (3,598.5) | (4,723.7) |
Future production costs | (9,577.7) | (8,972.5) | (14,138.6) |
Future income taxes | (1,287.0) | (273.5) | (1,060.7) |
Future net cash flows | 7,333.9 | 4,704.8 | 7,516.0 |
10% annual discount for estimated timing of cash flows | (3,411.0) | (2,124.8) | (3,656.9) |
Standardized measure of discounted future net cash flows | 3,922.9 | 2,580.0 | 3,859.1 | $ 9,905.2
United States [Member] |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | 12,885.8 | 9,477.9 | 12,373.9 |
Future development costs | (2,079.5) | (1,691.1) | (2,620.5) |
Future production costs | (4,765.3) | (3,981.6) | (4,955.4) |
Future income taxes | (893.7) | (118.9) | (339.7) |
Future net cash flows | 5,147.3 | 3,686.3 | 4,458.3 |
10% annual discount for estimated timing of cash flows | (2,698.2) | (1,799.5) | (2,430.0) |
Standardized measure of discounted future net cash flows | 2,449.1 | 1,886.8 | 2,028.3 |
Canada [Member] |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | 4,714.3 | 3,752.7 | 8,922.0 |
Future development costs | (1,081.7) | (1,143.6) | (1,145.4) |
Future production costs | (2,507.4) | (2,329.7) | (5,892.7) |
Future income taxes | (161.1) | (81.3) | (504.8) |
Future net cash flows | 964.1 | 198.1 | 1,379.1 |
10% annual discount for estimated timing of cash flows | (394.6) | (95.0) | (666.8) |
Standardized measure of discounted future net cash flows | 569.5 | 103.1 | 712.3 |
Malaysia [Member] |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | 4,392.0 | 4,318.7 | 6,143.1 |
Future development costs | (632.3) | (763.8) | (957.8) |
Future production costs | (2,305.0) | (2,661.2) | (3,290.5) |
Future income taxes | (232.2) | (73.3) | (216.2) |
Future net cash flows | 1,222.5 | 820.4 | 1,678.6 |
10% annual discount for estimated timing of cash flows | (318.2) | (230.3) | (560.1) |
Standardized measure of discounted future net cash flows | $ 904.3 | $ 590.1 | $ 1,118.5 |

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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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