LINES OF CREDIT - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2015
Line of Credit Facility [Line Items]
Line of credit, amount outstanding		$ 0
Compensating balance requirments for our letters of credit		$ 17
Revolving credit facility, new
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	$ 1,000
Line of credit, expiration date	Sep. 30, 2018
Revolving credit facility, old
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	$ 1,000
Line of credit, expiration date	Jun. 30, 2015