Debt (Schedule Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Debt	$ 2,963	$ 2,796
Less: current debt obligations	81	83
Long-term debt	2,882	2,713
2.20% Senior Notes Due 2013 [Member]
Debt Instrument [Line Items]
Debt	458	461
3.75% Senior Notes Due 2014 [Member]
Debt Instrument [Line Items]
Debt	700	699
2.50% Senior Notes Due 2016 [Member]
Debt Instrument [Line Items]
Debt	521	518
4.875% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt	495	495
1.58% Yen-Denominated Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Debt	102	104
2.04% Yen-Denominated Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt	160	164
Yen-denominated credit facility
Debt Instrument [Line Items]
Debt	81	83
Commercial paper borrowings [Member]
Debt Instrument [Line Items]
Debt	$ 446	$ 272