Debt (Schedule Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Senior Notes Due 2013 [Member]	Dec. 31, 2011 Senior Notes Due 2013 [Member]	Mar. 10, 2010 Senior Notes Due 2013 [Member]	Mar. 31, 2012 Senior Notes Due 2014 [Member]	Dec. 31, 2011 Senior Notes Due 2014 [Member]	Jul. 28, 2009 Senior Notes Due 2014 [Member]	Mar. 31, 2012 Senior Notes Due 2016 [Member]	Dec. 31, 2011 Senior Notes Due 2016 [Member]	Dec. 01, 2010 Senior Notes Due 2016 [Member]	Mar. 31, 2012 Senior Notes Due 2019 [Member]	Dec. 31, 2011 Senior Notes Due 2019 [Member]	Jul. 28, 2009 Senior Notes Due 2019 [Member]	Mar. 31, 2012 Yen-Denominated Senior Note 1.58% [Member]	Dec. 31, 2011 Yen-Denominated Senior Note 1.58% [Member]	Apr. 28, 2010 Yen-Denominated Senior Note 1.58% [Member]	Mar. 31, 2012 Yen-Denominated Senior Note 2.04% [Member]	Dec. 31, 2011 Yen-Denominated Senior Note 2.04% [Member]	Apr. 28, 2010 Yen-Denominated Senior Note 2.04% [Member]	Mar. 31, 2012 Yen-Denominated Credit Facility Due 2012 [Member]	Dec. 31, 2011 Yen-Denominated Credit Facility Due 2012 [Member]	Mar. 31, 2012 Commercial Paper Borrowings [Member]	Dec. 31, 2011 Commercial Paper Borrowings [Member]
Debt Instrument [Line Items]
Total debt	$ 2,986	$ 2,796	$ 459	$ 461		$ 700	$ 699		$ 519	$ 518		$ 495	$ 495		$ 98	$ 104		$ 154	$ 164		$ 78	$ 83	$ 483	$ 272
Less: current debt obligations	78	83
Long-term debt	$ 2,908	$ 2,713
Interest rate			2.20%		2.20%	3.75%		3.75%	2.50%		2.50%	4.875%		4.875%	1.58%		1.58%	2.04%		2.04%