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Segment information (Condensed Statements Of Comprehensive Earnings And Balance Sheets Of Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Oil, gas and NGL sales | $ 2,588 | $ 2,341 | $ 7,824 | $ 6,367 |
Oil, gas and NGL derivatives | 748 | (141) | 29 | (95) |
Marketing and midstream revenues | 2,000 | 514 | 5,718 | 1,501 |
Revenues from external customers | 5,336 | 2,714 | 13,571 | 7,773 |
Depreciation, depletion and amortization | 842 | 691 | 2,409 | 2,069 |
Interest expense | 118 | 104 | 366 | 322 |
Asset impairments |  | 7 |  | 1,960 |
Earnings (loss) before income taxes | 1,654 | 639 | 3,768 | (326) |
Income tax expense (benefit) | 613 | 210 | 1,698 | (99) |
Net earnings (loss) | 1,041 | 429 | 2,070 | (227) |
Net earnings (loss) attributable to noncontrolling interests | 25 |  | 55 |  |
Net earnings (loss) attributable to Devon | 1,016 | 429 | 2,015 | (227) |
Property and equipment, net | 35,169 |  | 35,169 |  | 28,447
Total assets | 50,839 |  | 50,839 |  | 42,877
Capital expenditures | 1,755 | 1,693 | 11,294 | 5,027 |
Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Interest expense | (11) | (10) | (31) | (24) |
Total assets | (117) |  | (117) |  |
Eliminations [Member] | Intersegment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers | (199) | (342) | (672) | (1,005) |
United States [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments |  |  | 1 |  |
Revenues from external customers | 4,199 | 1,687 | 10,067 | 5,033 |
Depreciation, depletion and amortization | 655 | 444 | 1,794 | 1,287 |
Interest expense | 95 | 94 | 303 | 284 |
Asset impairments |  | 7 |  | 1,117 |
Earnings (loss) before income taxes | 1,461 | 366 | 2,219 | 96 |
Income tax expense (benefit) | 557 | 141 | 1,121 | 10 |
Net earnings (loss) | 904 | 225 | 1,098 | 86 |
Net earnings (loss) attributable to noncontrolling interests |  |  | 1 |  |
Net earnings (loss) attributable to Devon | 904 |  | 1,097 |  |
Property and equipment, net | 23,764 |  | 23,764 |  | 18,201
Total assets | 30,533 |  | 30,533 |  | 27,080
Capital expenditures | 1,213 | 1,219 | 9,748 | 3,477 |
Canada [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers | 481 | 791 | 1,671 | 2,052 |
Depreciation, depletion and amortization | 113 | 199 | 419 | 643 |
Interest expense | 20 | 20 | 61 | 62 |
Asset impairments |  |  |  | 843 |
Earnings (loss) before income taxes | 109 | 219 | 1,310 | (559) |
Income tax expense (benefit) | 38 | 50 | 517 | (158) |
Net earnings (loss) | 71 | 169 | 793 | (401) |
Net earnings (loss) attributable to Devon | 71 |  | 793 |  |
Property and equipment, net | 6,882 |  | 6,882 |  | 8,478
Total assets | 10,895 |  | 10,895 |  | 13,560
Capital expenditures | 335 | 437 | 1,055 | 1,377 |
EnLink [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers | 656 | 236 | 1,833 | 688 |
Depreciation, depletion and amortization | 74 | 48 | 196 | 139 |
Interest expense | 14 |  | 33 |  |
Earnings (loss) before income taxes | 84 | 54 | 239 | 137 |
Income tax expense (benefit) | 18 | 19 | 60 | 49 |
Net earnings (loss) | 66 | 35 | 179 | 88 |
Net earnings (loss) attributable to noncontrolling interests | 25 |  | 54 |  |
Net earnings (loss) attributable to Devon | 41 |  | 125 |  |
Property and equipment, net | 4,523 |  | 4,523 |  | 1,768
Total assets | 9,528 |  | 9,528 |  | 2,237
Capital expenditures | 207 | 37 | 491 | 173 |
EnLink [Member] | Intersegment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers | $ 199 | $ 342 | $ 672 | $ 1,005 |

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