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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) MMcfe $ / MMBTU $ / bbl $ / Mcf MMcf MBbls | Dec. 31, 2016 MMcfe $ / MMBTU $ / bbl $ / Mcf MMcf MBbls | Dec. 31, 2015 MMcfe $ / MMBTU $ / bbl $ / Mcf MMcf MBbls | Dec. 31, 2014 MMcfe MMcf MBbls
Reserve Quantities [Line Items] |  |  |  |  |
Percentage of proved resources reviewed by consultants |  | 98.00% |  |  |
Statement That Reserve Estimates Differ From Auditors |  | more than 10% |  |  |
Proved Reserve And Pretax Present Value of Reserve Discounted |  | 10.00% |  |  |
Variance in reserve estimates |  | less than 5%. |  |  |
Scheduled to be drilling period maximum for undeveloped reserves |  | Scheduled to be drilled within five years |  |  |
Reserve attributable to natural gas |  | 82.00% | 86.00% | 80.00% |
Revisions of positive pricing |  | 46,000 |  |  |
Improved recoveries |  | 597,000 | 393,000 | 781,000 |
Proved undeveloped reserves dropped |  | 668,000 | 269,000 | 1,200,000 |
Cost spent on undeveloped reserves transferred to developed reserves | $ |  | $ 920 |  |  |
Estimated future development costs in 2018 | $ |  | 717 |  |  |
Estimated future development costs in 2019 | $ |  | 707 |  |  |
Estimated future development costs in 2020 | $ |  | $ 567 |  |  |
Proved undeveloped reserves reported for more than five years |  | 64,000 |  |  |
Maximum |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Percentage of proved undeveloped reserves reported for more than five years |  | 1.00% |  |  |
Crude Oil and NGL |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Benchmark price used for calculating average realized prices | $ / bbl |  | 51.19 | 42.68 | 50.13 |
Crude Oil |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Estimate reserve information average realized prices | $ / bbl |  | 45.73 | 37.41 | 35.07 |
Proved developed and undeveloped reserves | MBbls |  | 69,854 | 70,252 | 53,193 | 48,658
NGLs |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Estimate reserve information average realized prices | $ / bbl |  | 17.84 | 13.44 | 11.74 |
Proved developed and undeveloped reserves | MBbls |  | 763,264 | 630,066 | 549,135 | 515,907
Natural Gas |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Estimate reserve information average realized prices | $ / Mcf |  | 2.60 | 2.07 | 2.07 |
Proved developed and undeveloped reserves | MMcf |  | 10,263,649 | 7,870,416 | 6,277,697 | 6,922,836
Natural Gas, Per Thousand Cubic Feet |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Benchmark price used for calculating average realized prices | $ / MMBTU |  | 2.98 | 2.48 | 2.59 |
Natural Gas Equivalents |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved reserves from drilling activities and evaluations of proved areas | [1] | 3,487,519 | 1,394,134 | 1,265,348 |
Proved developed and undeveloped reserve balances | [1] | 15,262,361 | 12,072,322 | 9,891,663 | 10,310,229
Revisions of previous estimates | [1] | 506,919 | 255,794 | (211,163) |
Revisions of positive performance |  | 532,000 | 154,000 |  |
Ethane and Natural Gas Equivalents |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserve balances |  | 1,596,000 | 1,367,000 | 1,296,000 |
Ethane Reserves and NGLs |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserves | MBbls |  | 360,600 | 308,900 | 292,800 |
[1] | Oil and NGLs are converted to mcfe at the rate of one barrel equals six mcf based upon the approximate relative energy content of oil to natural gas, which is not indicative of the relationship of oil and natural gas prices.

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