COMMITMENTS AND CONTINGENCIES - LESSOR INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	[1]
Lessee, Lease, Description [Line Items]
Property, plant and equipment	$ 47,907		$ 47,907		$ 46,615
Accumulated depreciation	(12,625)		(12,625)		(12,176)
Property, plant and equipment, net	35,282		35,282		$ 34,439
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2019 (excluding first six months of 2019)	106		106
2020	200		200
2021	200		200
2022	200		200
2023	200		200
Thereafter	2,615		2,615
Total undiscounted cash flows	3,521		3,521
Minimum lease payments	49	$ 47	99	$ 96
Variable lease payments	2	24	6	37
Total revenues from operating leases	51	71	105	133
Assets Leased to Others [Member]
Lessee, Lease, Description [Line Items]
Property, plant and equipment	1,033		1,033
Accumulated depreciation	(160)		(160)
Property, plant and equipment, net	873		873
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
Depreciation	$ 10	$ 19	$ 19	$ 36

[1] Derived from audited financial statements.