LEASES (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Operating Lease Cost	$ 7	$ 5	$ 12	$ 10
Short-term Lease Cost	8	5	14	11
Variable Lease, Cost	16	2	18	4
Finance Lease, Right-of-Use Asset, Amortization	1	1	1	1
Lease, Cost	32	$ 13	45	26
Operating cash flows for operating leases			11	10
Finance Lease, Principal Payments			2	$ 1
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability			0		$ 48
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability			5		3
Operating lease right-of-use assets	114		114		123
Finance Lease, Right-of-Use Asset	19		19		15
Accumulated depreciation	(5,908)		(5,908)		(5,824)
Total Lease Assets	123		123		130
Operating lease liabilities - current	18		18		19
Finance Lease, Liability, Current	3		3		2
Operating lease liabilities - noncurrent	97		97		105
Finance Lease, Liability, Noncurrent	7		7		5
Total Lease Liabilities	$ 125		$ 125		$ 131
Operating Lease, Weighted Average Remaining Lease Term	7 years 1 month 6 days		7 years 1 month 6 days		7 years 6 months
Finance Lease, Weighted Average Remaining Lease Term	3 years 7 months 6 days		3 years 7 months 6 days		3 years 4 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	3.30%		3.30%		3.28%
Finance Lease, Weighted Average Discount Rate, Percent	2.64%		2.64%		3.62%
Lessee, Operating Lease, Liability, Payments, Remainder of 2020	$ 11		$ 11
Finance Lease, Liability, Payments, Due 2020	1		1
Lessee, Operating Lease, Liability, Payments, Due 2021	22		22
Finance Lease, Liability, Payments, Due 2021	3		3
Lessee, Operating Lease, Liability, Payments, Due 2022	20		20
Finance Lease, Liability, Payments, Due 2022	3		3
Lessee, Operating Lease, Liability, Payments, Due 2023	20		20
Finance Lease, Liability, Payments, Due 2023	2		2
Lessee, Operating Lease, Liability, Payments, Due 2024	18		18
Finance Lease, Liability, Payments, Due 2024	1		1
Lessee, Operating Lease, Liability, Payments, Due 2025 and thereafter	38		38
Finance Lease, Liability, Payments, Due 2025 and thereafter	0		0
Lessee, Operating Lease, Liability, Payments, Due	129		129
Finance Lease, Liability, Payment, Due	10		10
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	14		14
Finance Lease, Liability, Undiscounted Excess Amount	0		0
Operating Lease, Liability	115		115
Finance Lease, Liability	10		10
finance leases [Member]
Accumulated depreciation	$ (10)		$ (10)		$ (8)

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