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Segment information (Condensed Statements Of Comprehensive Earnings And Balance Sheets Of Reportable Segments) (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
segment
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting Information [Line Items]          
Revenues from external customers $ 3,601 $ 5,336 $ 10,259 $ 13,571  
Depreciation, depletion and amortization 744 842 2,488 2,409  
Interest expense 138 $ 118 383 $ 366  
Asset impairments 5,851 15,479  
Earnings (loss) before income taxes (5,623) $ 1,654 (15,726) $ 3,768  
Income tax expense (benefit) (1,714) 613 (5,435) 1,698  
Net earnings (loss) (3,909) 1,041 (10,291) 2,070  
Net earnings (loss) attributable to noncontrolling interests (402) 25 (369) 55  
Net earnings (loss) attributable to Devon (3,507) 1,016 (9,922) 2,015  
Property and equipment, net 22,775 35,169 22,775 35,169 $ 36,296
Total assets 34,351 50,839 34,351 50,839 50,637
Capital expenditures 1,187 1,755 4,460 11,294  
Eliminations [Member]          
Segment Reporting Information [Line Items]          
Interest expense (11) (11) (34) (31)  
Total assets (113) (117) (113) (117) (124)
Eliminations [Member] | Intersegment [Member]          
Segment Reporting Information [Line Items]          
Revenues from external customers (172) (199) $ (499) (672)  
United States [Member]          
Segment Reporting Information [Line Items]          
Number of reportable segments | segment     1    
Revenues from external customers [1] 2,381 4,197 $ 6,570 10,065  
Depreciation, depletion and amortization [1] 510 654 1,817 1,791  
Interest expense [1] 96 95 271 303  
Asset impairments [1] 4,716   14,344    
Earnings (loss) before income taxes [1] (4,464) 1,463 (14,450) 2,224  
Income tax expense (benefit) [1] (1,605) 557 (5,334) 1,121  
Net earnings (loss) [1] (2,859) 906 (9,116) 1,103  
Net earnings (loss) attributable to noncontrolling interests [1]     1 1  
Net earnings (loss) attributable to Devon [1] (2,859) 906 (9,117) 1,102  
Property and equipment, net [1] 11,586 23,661 11,586 23,661 24,463
Total assets [1] 17,436 30,431 17,436 30,431 32,037
Capital expenditures [1] 974 1,211 3,205 9,724  
Canada [Member]          
Segment Reporting Information [Line Items]          
Revenues from external customers 221 481 802 1,671  
Depreciation, depletion and amortization 134 113 382 419  
Interest expense 22 20 70 61  
Asset impairments 336   336    
Earnings (loss) before income taxes (401) 109 (609) 1,310  
Income tax expense (benefit) (116) 38 (129) 517  
Net earnings (loss) (285) 71 (480) 793  
Net earnings (loss) attributable to Devon (285) 71 (480) 793  
Property and equipment, net 5,623 6,882 5,623 6,882 6,790
Total assets 6,754 10,895 6,754 10,895 8,517
Capital expenditures 108 335 478 1,055  
General Partner And EnLink [Member]          
Segment Reporting Information [Line Items]          
Revenues from external customers [1] 999 658 2,887 1,835  
Depreciation, depletion and amortization [1] 100 75 289 199  
Interest expense [1] 31 14 76 33  
Asset impairments [1] 799   799    
Earnings (loss) before income taxes [1] (758) 82 (667) 234  
Income tax expense (benefit) [1] 7 18 28 60  
Net earnings (loss) [1] (765) 64 (695) 174  
Net earnings (loss) attributable to noncontrolling interests [1] (402) 25 (370) 54  
Net earnings (loss) attributable to Devon [1] (363) 39 (325) 120  
Property and equipment, net [1] 5,566 4,626 5,566 4,626 5,043
Total assets [1] 10,274 9,630 10,274 9,630 $ 10,207
Capital expenditures [1] 105 209 777 515  
General Partner And EnLink [Member] | Intersegment [Member]          
Segment Reporting Information [Line Items]          
Revenues from external customers [1] $ 172 $ 199 $ 499 $ 672  
[1] Due to Devon's control of EnLink through its control of the General Partner, the acquisition of VEX by EnLink from Devon in the second quarter of 2015 was considered a transfer of net assets between entities under common control, and EnLink was required to recast its financial statements as of September 30, 2015 to include the activities of such assets from the date of common control. Therefore, the results of VEX for prior periods have been moved from the U.S. segment to the EnLink segment.