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SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) - USD ($) $ in Thousands	Jun. 11, 2015	Mar. 31, 2016	Dec. 31, 2015
Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial paper outstanding		$ 545,000	$ 330,000
Senior Notes [Member] | Unsecured Senior Notes, 4.60% [Member]
Debt Instrument [Line Items]
Debt issuance date	Jun. 11, 2015
Face amount of debt	$ 1,000,000
Stated interest rate	4.60%
Maturity date	Jun. 15, 2045
Debt redemption, description	Prior to December 15, 2044, the Company may redeem the Notes in whole at any time or in part from time to time at a “make-whole” redemption price. This redemption price is calculated by reference to the then-current yield on a US treasury security with a maturity comparable to the remaining term of the Notes plus 25 basis points, together with accrued and unpaid interest, if any, to the redemption date. On or after December 15, 2044, the Company may redeem the Notes in whole at any time or in part from time to time at 100% of their principal amount, together with accrued and unpaid interest, if any, to the redemption date.
Basis points	0.25%
Debt redemption percent	100.00%
Debt issuance cost	$ 10,000
Debt, fair value		$ 1,000,000	$ 1,000,000

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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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-Publisher FASB
-Name Accounting Standards Codification
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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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