Long-Term Debt and Short-Term Borrowings (Details 2)					12 Months Ended			12 Months Ended		1 Months Ended		1 Months Ended		1 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended		1 Months Ended		3 Months Ended	0 Months Ended	1 Months Ended	3 Months Ended		1 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended	12 Months Ended		1 Months Ended
	Dec. 31, 2011 USD ($)	Sep. 30, 2011 USD ($)	Jun. 30, 2007 USD ($) Security	Dec. 31, 2003 USD ($)	Dec. 31, 2007 Eurobond 750 Million Euros Issued July2007 EUR (€) Y	Dec. 31, 2011 Eurobond 750 Million Euros Issued July2007 USD ($)	Aug. 31, 2010 Eurobond 750 Million Euros Issued July2007 EUR (€)	Dec. 31, 2007 Eurobond 275 Million Euros Issued December2007 Y	Dec. 31, 2011 Eurobond 275 Million Euros Issued December2007 USD ($)	Sep. 30, 2011 Fixed rate Medium-term note due 2016	Dec. 31, 2011 Fixed rate Medium-term note due 2016	Aug. 31, 2008 Fixed rate Medium-term note due 2013 Y	Dec. 31, 2011 Fixed rate Medium-term note due 2013	Oct. 31, 2008 Floating rate Medium-term note due 2011 Y	Dec. 31, 2011 Floating rate Medium-term note due 2011 USD ($)	Dec. 31, 2011 Floating rate notes due in 2027, 2040 and 2041 Y	Mar. 31, 2007 Fixed rate 30-year bond due 2037 Y	Dec. 31, 2011 Fixed rate 30-year bond due 2037	Dec. 31, 2007 Fixed rate Medium-term note due 2012 Y	Dec. 31, 2011 Fixed rate Medium-term note due 2012	Dec. 31, 2011 Fixed rate 30-year debenture due 2028 Y	Nov. 15, 2002 Fixed rate Convertible notes Y	Nov. 30, 2002 Fixed rate Convertible notes USD ($)	Sep. 30, 2011 Fixed rate Convertible notes USD ($)	Mar. 31, 2010 Floating rate note payable in Yen due 2011 JPY (¥) Payment	Dec. 31, 2004 Floating rate note due 2044 Y	Dec. 31, 2011 Floating rate note due 2044	Dec. 31, 2011 Floating rate note payable in Canadian dollar originally due 2012 CAD	Sep. 30, 2011 Floating rate note payable in Canadian dollar originally due 2012 CAD	Dec. 31, 2011 Floating rate note payable in Canadian dollar originally due 2012 CAD	Dec. 31, 2010 Floating rate note payable in Canadian dollar originally due 2012 Payment	Dec. 31, 2011 Five-year credit facility agreement USD ($) Y	Dec. 31, 2011 Five-year credit facility agreement USD ($) Quarters	Aug. 31, 2011 Five-year credit facility agreement USD ($)	Nov. 30, 2006 Fixed rate note which matured in November 2009 Y	Aug. 31, 2011 One-year credit facility agreement with HSBC Bank USA USD ($) Y	Dec. 31, 2011 One-year credit facility agreement with HSBC Bank USA USD ($)	Dec. 31, 2011 Other borrowings USD ($)	Dec. 31, 2011 Stand alone letters of credit USD ($)	Dec. 31, 2011 International line of credit USD ($)
Long-Term Debt
Repayment of debt															$ 800,000,000									$ 227,000,000				150,750,000	50,250,000	201,000,000
Debt instrument term					7			7		5		5		3			30		5		30	30				40									3
Number of equal installment payments																									3
Payment terms, equal installment amounts																									5,800,000,000
Interest rate, reference rate																									three-month Tokyo Interbank Offered Rate
Interest rate, amount added to reference rate (in basis points)																									0.40%
Number of equal installment payments due under previous loan agreement																															4
Portion of repayment of debt classified as cash flows from operating activies																								24,000,000
Gross proceeds from the offering																							550,000,000
Proceeds, net of issuance costs																							540,000,000
Medium-term notes program established in connection with a "well-known seasoned issuer" shelf registration		3,000,000,000	3,000,000,000	1,500,000,000
Interest rate - stated					5.00%			5.00%			1.375%		4.375%	4.50%				5.70%		4.65%
Number of debt securities issued under the medium-term notes program			3
Repurchase price of notes until 2013 - low end of range																											98.00%
Repurchase price of notes until 2013 - high end of range																											99.00%
Repurchase price of notes from 2014 to maturity																											100.00%
Principal amount (approximate book value in U.S. Dollars)						1,006,000,000			358,000,000
Notional amount of interest rate, fair value hedge derivatives					400,000,000										800,000,000
Termination of notional amount of fixed-to-floating interest rate swap							150,000,000
Notional amount remaining after partial termination of fixed-to-floating interest rate swap							250,000,000
Number of years after date of issuance that put options commence																10
Number of years after put options commence when additional put options occur on each anniversary thereafter until final maturity																3
Repurchase price of notes according to redemption schedule - low end of range (as a percent)																99.00%
Repurchase price of notes according to redemption schedule - high end of range (as a percent)																100.00%
Line of Credit Facility
Current borrowing capacity																																1,500,000,000	1,500,000,000	1,500,000,000
Term of credit facility (in years)																																5				1
Maximum borrowing capacity that has current restrictions																																500,000,000	500,000,000
Maximum borrowing capacity																																2,000,000,000	2,000,000,000			200,000,000	200,000,000
Amount of short-term lines of credit and credit facilities utilized in connection with normal business activities	147,000,000																																				121,000,000	8,000,000	100,000,000	18,000,000
Available short-term lines of credit and credit facilities	$ 1,785,000,000
Required EBITDA to Interest Ratio																																3.0	3.0
Actual EBITDA to Interest Ratio																																40	40
Number of consecutive quarters over which the ratio of required EBITDA to Interest Ratio is calculated																																	4