Significant Accounting Policies, Inventory LOCOM Adjustment (Details) (Sequent [Member], USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Sequent [Member]
Inventory LOCOM Adjustment [Line Items]
Inventory LOCOM Adjustment	$ 9	$ 4	$ 9	$ 8