Income Taxes (Reconciliation Of Unrecognized Tax Benefits (Excluding Interest And Penalties)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Balance at beginning of year	$ 46	$ 48	$ 24
Additions for tax positions of the current year			1
Additions for tax positions of prior years	13	30	24
Reductions for tax positions of prior years	(3)	(5)
Settlements with tax authorities	(4)	(22)	(5)
Expiration of the statute of limitations		(5)
Foreign currency translation	(1)		4
Balance at end of year	$ 51	$ 46	$ 48