Long-Term Debt and Short-Term Borrowings (Details) In Millions, unless otherwise specified	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2007 Eurobond 750 Million Euros Issued July2007 EUR (€)	Dec. 31, 2007 Eurobond 275 Million Euros Issued December2007 EUR (€)	Dec. 31, 2011 Fixed rate Eurobond Due 2014 USD ($)	Dec. 31, 2011 Fixed rate Eurobond Due 2014 EUR (€)	Dec. 31, 2010 Fixed rate Eurobond Due 2014 USD ($)	Dec. 31, 2011 Fixed rate Medium-term note due 2016 USD ($)	Dec. 31, 2011 Fixed rate Medium-term note due 2013 USD ($)	Dec. 31, 2010 Fixed rate Medium-term note due 2013 USD ($)	Aug. 31, 2008 Fixed rate Medium-term note due 2013 USD ($)	Dec. 31, 2010 Floating rate Medium-term note due 2011 USD ($)	Oct. 31, 2008 Floating rate Medium-term note due 2011 USD ($)	Dec. 31, 2011 Fixed rate 30-year bond due 2037 USD ($)	Dec. 31, 2010 Fixed rate 30-year bond due 2037 USD ($)	Dec. 31, 2011 Fixed rate Medium-term note due 2012 USD ($)	Dec. 31, 2010 Fixed rate Medium-term note due 2012 USD ($)	Dec. 31, 2011 Floating rate Eurobond Due 2014 USD ($)	Dec. 31, 2011 Floating rate Eurobond Due 2014 EUR (€)	Dec. 31, 2010 Floating rate Eurobond Due 2014 USD ($)	Dec. 31, 2011 Fixed rate 30-year debenture due 2028 USD ($)	Dec. 31, 2010 Fixed rate 30-year debenture due 2028 USD ($)	Dec. 31, 2010 Fixed rate Convertible notes USD ($)	Nov. 15, 2002 Fixed rate Convertible notes USD ($)	Dec. 31, 2010 Floating rate note payable in Yen due 2011 USD ($)	Mar. 31, 2010 Floating rate note payable in Yen due 2011 USD ($)	Mar. 31, 2010 Floating rate note payable in Yen due 2011 JPY (¥)	Dec. 31, 2011 Floating rate note due 2041 USD ($)	Dec. 31, 2010 Floating rate note due 2041 USD ($)	Dec. 31, 2011 Floating rate note due 2044 USD ($)	Dec. 31, 2010 Floating rate note due 2044 USD ($)	Mar. 31, 2011 Floating rate note payable in Canadian dollar originally due 2012 CAD	Dec. 31, 2010 Floating rate note payable in Canadian dollar originally due 2012 USD ($)	Dec. 31, 2010 Floating rate note payable in Canadian dollar originally due 2012 CAD	Dec. 31, 2011 Various fixed and floating rate Other borrowings due 2012-2040 USD ($)	Dec. 31, 2010 Various fixed and floating rate Other borrowings due 2012-2040 USD ($)	Nov. 30, 2006 Fixed rate note which matured in November 2009 USD ($)	Dec. 31, 2011 Current portion of long-term debt USD ($)	Dec. 31, 2010 Current portion of long-term debt USD ($)	Dec. 31, 2011 Other borrowings USD ($)	Dec. 31, 2010 Other borrowings USD ($)
Long-Term Debt
Principal amount			€ 750.0	€ 275.0		€ 775.0		$ 1,000.0	$ 850.0		$ 850.0		$ 800.0	$ 750.0		$ 500.0			€ 250.0		$ 330.0			$ 639.0		$ 188.0	¥ 17,400.0	$ 97.0		$ 59.0		201.0		100.5			$ 400.0
Interest rate - effective					4.30%	4.30%		1.62%	4.42%					5.73%		4.67%		1.92%	1.92%		6.01%							0.22%		0.20%					0.70%			4.19%		4.93%
Total long-term debt	5,047	5,368			1,017		1,055	992	849	849		806		747	747	500	500	347		357	348	349	226		142			97	100	59	60		101		91	76		563	1,185
Long-term debt (excluding current portion)	4,484	4,183
Short-Term Borrowings and Current Portion of Long-Term Debt
Total short-term borrowings and current portion of long-term debt	682	1,269																																						119	84
Weighted-Average Effective Interest Rate
Short-term weighted-average effective interest rate	4.32%	2.41%
Long-term weighted-average effective interest rate	3.76%	4.22%
Maturities of long-term debt
2012	563
2013	927
2014	1,463
2015	2
2016	995
After 2016	1,097
Total	5,047	5,368			1,017		1,055	992	849	849		806		747	747	500	500	347		357	348	349	226		142			97	100	59	60		101		91	76		563	1,185
Floating rate note payments due in 2013	$ 73