Debt And Related Expenses (Schedule Of Net Financing Cost Components) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Capitalized interest	$ (251)
Total net financing costs	904	$ 517	$ 526
Devon [Member]
Debt Instrument [Line Items]
Interest based on debt outstanding	488	450	468
Early retirement of debt	269		48
Capitalized interest	(64)	(54)	(58)
Other	21	14	15
Total net financing costs	714	410	473
EnLink [Member]
Debt Instrument [Line Items]
Interest based on debt outstanding	144	115	64
Interest accretion on deferred installment payment	52
Other	(6)	(8)	(11)
Total net financing costs	$ 190	$ 107	$ 53