Risk Management (Schedule Of Largest Notional Amounts Of The Positions To Buy Or Sell Foreign Currency) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Foreign Currency Contracts
Notional amount of foreign currency derivatives	$ 316	$ 524
Chinese Renminbi
Foreign Currency Contracts
Notional amount of foreign currency derivatives	(119)	(283)
British Pound
Foreign Currency Contracts
Notional amount of foreign currency derivatives	88	55
Brazilian Real
Foreign Currency Contracts
Notional amount of foreign currency derivatives	(39)	(34)
Malaysian Ringgits
Foreign Currency Contracts
Notional amount of foreign currency derivatives	21	37
Polish Zloty
Foreign Currency Contracts
Notional amount of foreign currency derivatives	$ 13	$ 12