FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Values and Fair Values of Non-Current Financial Assets and Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans		$ 125	$ 142
Other noncurrent liabilities	[1]	(2,372)	(2,610)
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans		125	142
Total noncurrent financial assets		125	142
Senior Notes		(5,928)	(5,087)
Commercial paper		(2,245)	(2,371)
Other long-term debt		(184)	(217)
Other noncurrent liabilities		(153)	(178)
Total noncurrent financial liabilities		(8,510)	(7,853)
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans		116	130
Total noncurrent financial assets		116	130
Senior Notes		(5,794)	(5,126)
Commercial paper		(2,245)	(2,371)
Other long-term debt		(182)	(221)
Other noncurrent liabilities		(153)	(178)
Total noncurrent financial liabilities		$ (8,374)	$ (7,896)

[1] See Footnote 18. Related Party Transactions for disclosure of related party amounts.