COMMITMENTS AND CONTINGENCIES - LESSOR INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	[1]
Lessee, Lease, Description [Line Items]
Property, plant and equipment	$ 48,139		$ 48,139		$ 46,615
Accumulated depreciation	(12,619)		(12,619)		(12,176)
Property, plant and equipment, net	35,520		35,520		$ 34,439
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2019 (excluding first nine months of 2019)	50		50
2020	199		199
2021	199		199
2022	199		199
2023	199		199
Thereafter	2,588		2,588
Total undiscounted cash flows	3,434		3,434
Minimum lease payments	51	$ 47	150	$ 143
Variable lease payments	0	26	6	63
Total revenues from operating leases	51	73	156	206
Assets Leased to Others [Member]
Lessee, Lease, Description [Line Items]
Property, plant and equipment	1,112		1,112
Accumulated depreciation	(181)		(181)
Property, plant and equipment, net	931		931
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
Depreciation	$ 10	$ 19	$ 29	$ 55

[1] Derived from audited financial statements.