LONG-TERM DEBT - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term Debt	$ 2,964	$ 683
Less debt issuance costs	(18)	(3)
Less current portion	319	114
Long-term debt, net of current portion	$ 2,645	$ 569
Weighted-average fixed-interest rate	4.40%	5.70%
Weighted-average variable-interest rate	2.40%	1.80%
Proceeds from issuance of long-term debt, net of issuance costs	$ 2,044	$ 0	$ 51
Long-term debt payments	249	116	$ 119
Long-term Debt, Fiscal Year Maturity [Abstract]
2017	321
2018	351
2019	424
2020	451
2021	424
Thereafter	1,007
Long-term Debt	2,978
Fixed-rate notes payable due through 2028
Debt Instrument [Line Items]
Long-term Debt	1,179	520
Variable-rate notes payable due through 2028
Debt Instrument [Line Items]
Long-term Debt	$ 1,803	$ 166