Other Income And Expenses, Net (Components Of Other Income And Expenses, Net) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Interest income	$ 53		$ 67		$ 77
Foreign exchange gains (losses)	2	[1]	1	[1]	23	[1]
AFUDC equity	260		234		153
Deferred returns	10		15		(7)
Other	51		53		38
Total	376		370		284
Parent Company [Member]
Other	4		7		12
Total	$ 21		$ 6		$ 9

[1] Primarily relates to International Energy's remeasurement of certain cash and debt balances into the functional currency.