Other Expense (Schedule Of Components Of Other Expense) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other Expense [Abstract]
Above market and idle drilling and well services equipment charges	[1]	$ 22	$ 2	$ 73	$ 2
Transportation commitment charges	[2]	11	11	38	34
Restructuring Charges		9	0	24	0
Inventory valuation charges	[3]	13	3	21	7
Other		5	4	14	12
Total other expense		$ 60	$ 20	$ 170	$ 55

[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 reduce excess material and supplies inventories to their market values. See Note D for additional information on the fair value of materials and supplies inventory.