NOTES PAYABLE - Additional Information (Details)			1 Months Ended					3 Months Ended			3 Months Ended
	Mar. 09, 2015 series	Mar. 31, 2015 Senior notes USD ($)	Mar. 31, 2015 2.40% senior notes due March 2020 USD ($)	Mar. 31, 2015 2.40% senior notes due March 2020 JPY (¥)	Mar. 31, 2015 3.25% senior notes due March 2025 USD ($)	Mar. 31, 2015 3.25% senior notes due March 2025 JPY (¥)	Mar. 31, 2015 Notes Payable USD ($)	Mar. 31, 2015 $50 million dollar line of credit USD ($)	Mar. 31, 2015 $100 million dollar line of credit USD ($)	Mar. 31, 2015 Line of Credit USD ($)	Mar. 31, 2015 50 billion yen line of credit JPY (¥)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity								$ 50,000,000	$ 100,000,000		¥ 50,000,000,000
Number of Series of Senior Notes Issued Through a U.S. Public Debt Offering	2
Debt Instrument, Face Amount		1,000,000,000	550,000,000		450,000,000
Debt Instrument Effective Principal Amount After Cross Currency Swap				67,000,000,000		55,000,000,000
Debt instrument, interest rate, stated percentage			2.40%	2.40%	3.25%	3.25%
Debt Instrument, Term			5 years	5 years	10 years	10 years
Debt Instrument Effective Interest Rate Percentage After Interest Rate Swap			0.24%	0.24%	0.82%	0.82%
Line of credit facility, interest rate description								Borrowings will bear interest at the rate quoted by the bank and agreed upon at the time of making such loan and will have a three-month maturity period.	Borrowings will bear interest at the rate quoted by the bank and agreed upon at the time of making such loan and will have a three-month maturity period.		Borrowings will bear interest at LIBOR plus the applicable margin of 1.125%
Line of credit facility, commitment fee percentage											0.125%
Line of credit facility, amount outstanding								0	0		0
Debt instrument, debt default, amount							$ 0			$ 0