Other Expense (Schedule Of Components Of Other Expense) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Expense [Abstract]
Transportation commitment charges	[1]	$ 25	$ 13	$ 50	$ 27
Above market and idle drilling and well services equipment charges	[2]	10	28	31	51
Third-party vertical integration services		16	(5)	29	(4)
Terminated drilling rig contract charges		1	0	16	0
Tangible Asset Impairment Charges	[3]	1	3	5	9
Restructuring Charges		1	15	4	15
Other		13	4	19	9
Total other expense		67	58	154	107
GrossRevenuesIncludedInThirdPartyLossFromVerticalIntegrationServices		56	86	124	198
GrossExpensesIncludedInThirdPartyLossFromVerticalIntegrationServices		$ 72	$ 81	$ 153	$ 194

[1] Primarily represents expenses attributable to idle drilling rig fees, which are not chargeable to joint operations.

[2] Primarily represents firm transportation payments on excess pipeline capacity commitments.

[3] Primarily represents charges to terminate rig contracts that were not required to meet planned drilling activities.