Supplemental Information On Oil And Gas Operations (Results Of Operations) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) $ / Boe	Dec. 31, 2015 USD ($) $ / Boe	Dec. 31, 2014 USD ($) $ / Boe
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Oil, gas and NGL sales	$ 4,182	$ 5,382	$ 9,910
Lease operating expenses	(1,582)	(2,104)	(2,332)
General and administrative expenses	(168)	(224)	(210)
Production and property taxes	(231)	(342)	(503)
Depreciation, depletion and amortization	(1,143)	(2,581)	(2,896)
Gains on asset sales	1,351		1,077
Asset impairments	(4,100)	(19,249)
Accretion of asset retirement obligations	(74)	(74)	(88)
Income tax benefit (expense)	245	5,861	(1,767)
Results of operations	$ (1,520)	$ (13,331)	$ 3,191	[1]
Depreciation, depletion and amortization per Boe | $ / Boe	5.11	10.40	11.79
United States [Member]
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Oil, gas and NGL sales	$ 3,198	$ 4,356	$ 7,867
Lease operating expenses	(1,123)	(1,551)	(1,559)
General and administrative expenses	(148)	(196)	(153)
Production and property taxes	(200)	(309)	(466)
Depreciation, depletion and amortization	(817)	(2,107)	(2,365)
Gains on asset sales	1,351
Asset impairments	(2,809)	(17,992)
Accretion of asset retirement obligations	(49)	(47)	(49)
Income tax benefit (expense)		5,547	(1,199)
Results of operations	$ (597)	$ (12,299)	$ 2,076	[1]
Depreciation, depletion and amortization per Boe | $ / Boe	4.68	10.21	11.41
Canada [Member]
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Oil, gas and NGL sales	$ 984	$ 1,026	$ 2,043
Lease operating expenses	(459)	(553)	(773)
General and administrative expenses	(20)	(28)	(57)
Production and property taxes	(31)	(33)	(37)
Depreciation, depletion and amortization	(326)	(474)	(531)
Gains on asset sales			1,077
Asset impairments	(1,291)	(1,257)
Accretion of asset retirement obligations	(25)	(27)	(39)
Income tax benefit (expense)	245	314	(568)
Results of operations	$ (923)	$ (1,032)	$ 1,115	[1]
Depreciation, depletion and amortization per Boe | $ / Boe	6.65	11.30	13.80

[1] During 2014, Devon recognized a Canadian goodwill impairment, which is not reflected in these tables. See Note 5 for additional information.