LEASES LEASES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Lessor, Operating Lease, Lease Not yet Commenced, Assumption and Judgment, Value of Underlying Asset, Amount	$ 45
Operating Lease, Expense	147
Finance Lease, Right-of-Use Asset, Amortization	6
Finance Lease, Interest Expense	6
Finance Lease, Cost	12
Short-term Lease, Cost	55
Variable Lease, Cost	85
Sublease Income	(1)
Lease, Cost	298
Operating Lease, Payments	154
Finance Lease, Interest Payment on Liability	6
Finance Lease, Principal Payments	3
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	2,714
Operating Lease, Right-of-Use Asset	2,584	$ 0
Property, Plant and Equipment, Gross	61,764	61,437
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(38,272)	(37,775)
Total Lease Assets	2,878
Operating Lease, Liability, Current	477	0
Finance Lease, Liability, Current	20
Operating Lease, Liability, Noncurrent	2,126	0
Finance Lease, Liability, Noncurrent	349
Total Lease Liabilities	$ 2,972
Operating Lease, Weighted Average Remaining Lease Term	8 years 8 months
Finance Lease, Weighted Average Remaining Lease Term	18 years 8 months
Operating Lease, Weighted Average Discount Rate, Percent	4.00%
Finance Lease, Weighted Average Discount Rate, Percent	7.00%
Lessee, Operating Lease, Liability, Payments, Due 2019	$ 437	412
Finance Lease, Liability, Payments, Due 2019	38
Lessee, Operating Lease, Liability, Payments, Due 2020	515	369
Finance Lease, Liability, Payments, Due 2020	48
Lessee, Operating Lease, Liability, Payments, Due 2021	421	328
Finance Lease, Liability, Payments, Due 2021	46
Lessee, Operating Lease, Liability, Payments, Due 2022	343	297
Finance Lease, Liability, Payments, Due 2022	44
Lessee, Operating Lease, Liability, Payments, Due 2023	291	253
Finance Lease, Liability, Payments, Due 2023	71
Lessee, Operating Lease, Liability, Payments, Due 2024 and thereafter	1,157	978
Finance Lease, Liability, Payments, Due 2024 and thereafter	309
Lessee, Operating Lease, Liability, Payments, Due	3,164	$ 2,637
Finance Lease, Liability, Payments, Due	556
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	561
Finance Lease, Liability, Undiscounted Excess Amount	187
Operating Lease, Liability	2,603
Finance lease obligations	$ 369
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	10 years
Minimum [Member]
Lessee, Operating and Finance Leases, Remaining Lease Term	1 year
Maximum [Member]
Lessee, Operating and Finance Leases, Remaining Lease Term	50 years
Finance Leases [Member]
Property, Plant and Equipment, Gross	$ 437
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ (143)