Long-Term Debt and Short-Term Borrowings (Details)		3 Months Ended			3 Months Ended					3 Months Ended	1 Months Ended		3 Months Ended		3 Months Ended
	Sep. 30, 2011 USD ($)	Sep. 30, 2011 Floating rate note payable in Canadian dollar due 2012 CAD	Mar. 31, 2011 Floating rate note payable in Canadian dollar due 2012 CAD	Dec. 31, 2010 Floating rate note payable in Canadian dollar due 2012 CAD Payment	Mar. 31, 2010 Floating rate note payable in Yen due 2011 JPY (¥)	Sep. 30, 2011 Floating rate note payable in Yen due 2011 Payment	Mar. 31, 2011 Floating rate note payable in Yen due 2011 Payment	Sep. 30, 2010 Floating rate note payable in Yen due 2011 Payment	Mar. 31, 2010 Floating rate note payable in Yen due 2011 USD ($) Payment	Sep. 30, 2011 Fixed rate Convertible notes due 2032 USD ($)	Aug. 31, 2011 Five-year credit facility agreement USD ($) Y	Sep. 30, 2011 Five-year credit facility agreement USD ($)	Sep. 30, 2011 Floating rate Medium-term note due November 2011 USD ($)	Sep. 30, 2011 Five-year fixed rate notes USD ($)	Sep. 30, 2011 One-year credit facility agreement with HSBC Bank USA USD ($) Y	Sep. 30, 2011 Other credit facility agreements USD ($)
Short-Term Borrowings
Amount of short-term lines of credit and credit facilities utilized in connection with normal business activities															$ 121,000,000	$ 102,000,000
Maximum borrowing capacity												2,000,000,000			200,000,000
Term of credit facility (in years)											5				1
Long-Term Debt
Principal amount			201,000,000	100,500,000	17,400,000,000				188,000,000					1,000,000,000
Interest rate														1.375%
Carrying amount of debt		150,750,000
Maturities of long-term debt
Payment terms, equal installment amounts					5,800,000,000
Number of installment payments made						1	1	1
Number of equal installment payments									3
Number of equal installment payments due under previous loan agreement				4
Interest rate, reference rate					three-month Tokyo Interbank Offered Rate
Interest rate, amount added to reference rate (in basis points)									0.40%
Future repayment of debt													800,000,000
Repayment of debt		50,250,000								227,000,000
Portion of repayment of debt classified as cash flows from operating activies										24,000,000
Medium-term notes program established in connection with a prior "well-known seasoned issuer" shelf registration	3,000,000,000
Current borrowing capacity											1,500,000,000
Term of credit facility (in years)											5				1
Maximum borrowing capacity that has current restrictions												$ 500,000,000
Required EBITDA to Interest Ratio												3.0
Actual EBITDA to Interest Ratio												38