Other Expense (Schedule Of Components Of Other Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Other Expense [Abstract]
Above market and idle drilling and well services equipment charges	$ 23	[1]	$ 0	[1]
Transportation commitment charges	14	[2]	11	[2]
Inventory valuation charges	6	[3]	0	[3]
Other	5		2
Contingency and environmental accrual adjustments	0		2
Total other expense	$ 48		$ 15

[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] 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.