v2.4.0.6

Supplemental Information On Oil And Gas Operations (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 Boe
Reserve Quantities [Line Items] |  |  |
Capitalized general and administrative expenses | $ 337,000,000 | $ 311,000,000 | $ 332,000,000
Capitalized interest expenses | (72,000,000) | (76,000,000) | (94,000,000)
Proved undeveloped reserves | 782 |  |
Decrease in proved undeveloped reserves | 6.00% |  |
Percentage of total proved reserves | 26.00% |  |
Proved undeveloped reserves, drilling activities | 148 |  |
Proved undeveloped reserves, drilling activities, conversion | 130 |  |
Proved undeveloped reserves to proved developed reserves, conversion, percentage | 16.00% |  |
Increase in reserves due to adoption of SEC' modernization of oil and gas reporting (MMBoe) |  |  | 65
Percent increase in reserves due to adoption of SEC's modernization of oil and gas reporting |  |  | 2.00%
Average price per barrel of oil used to estimate proved oil reserves | 67.31 |  |
Average price per Mcf of gas used to estimated proved gas | 3.51 |  |
Average price per barrel of natural gas liquids used to estimate proved NGL reserves | 39.28 |  |
Future development costs | 11,500,000,000 |  |
Future development costs estimated to be spent in 2012 | 1,600,000,000 |  |
Future development costs estimated to be spent in 2013 | 1,400,000,000 |  |
Future development costs estimated to be spent in 2014 | 1,100,000,000 |  |
Future dismantlement, abandonment and rehabilitation costs | 2,200,000,000 |  |
Future net revenues discounted | 10.00% |  |
After tax future net revenue discounted | 17,800,000,000 |  |
Standardized measure discounted future income taxes | 7,100,000,000 |  |
Pre tax future net revenue | 24,900,000,000 |  |
Pre tax present value percentage | 10.00% |  |
Barnett Shale [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Proved developed and undeveloped reserves, revisions due to prices |  | 43 |
Proved developed and undeveloped reserves, extensions and discoveries | 115 | 87 | 204
Proved developed and undeveloped reserves, extensions and discoveries related to additions from in fill drilling activities | 77 | 43 | 203
Jackfish [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Unproved developed and undeveloped reserves, revisions due to prices |  |  | 331
Proved developed and undeveloped reserves, extensions and discoveries | 30 | 55 | 118
Proved developed and undeveloped reserves, extensions and discoveries related to additions from in fill drilling activities |  |  | 118
Proved undeveloped reserves | 367 | 396 |
Daily facility capacity | 35,000 |  |
Carthage [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Proved developed and undeveloped reserves, extensions and discoveries |  | 14 | 8
Granite Wash Area [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Proved developed and undeveloped reserves, extensions and discoveries | 17 |  |
Cana-Woodford Shale [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Proved developed and undeveloped reserves, extensions and discoveries | 162 | 101 | 49
Proved developed and undeveloped reserves, extensions and discoveries related to additions from in fill drilling activities | 80 | 47 | 24
Rocky Mountain [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Proved developed and undeveloped reserves, revisions due to prices |  | 22 |
Proved developed and undeveloped reserves, extensions and discoveries | 19 | 15 | 14
Deepwater Production In The Gulf [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Proved developed and undeveloped reserves, extensions and discoveries |  |  | 11
Haynesville Shale [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Proved developed and undeveloped reserves, extensions and discoveries |  |  | 7
Permian Basin [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Proved developed and undeveloped reserves, extensions and discoveries | 39 | 19 |
Oil And Gas Properties [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Capitalized interest expenses | $ 45,000,000 | $ 37,000,000 | $ 74,000,000
Total (MMBoe) [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Proved developed and undeveloped reserves, revisions due to prices | (21) | 72 | 177
Proved developed and undeveloped reserves, extensions and discoveries | 421 | 354 | 458
Proved developed and undeveloped reserves, extensions and discoveries related to additions from in fill drilling activities | 168 | 107 | 371
Total (MMBoe) [Member] | United States [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Proved developed and undeveloped reserves, revisions due to prices |  |  | (116)

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