DEBT AND FINANCING COSTS - Components of Financing Costs, Net (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Disclosure [Abstract]
Interest expense	$ 107	$ 109	$ 214	$ 216
Amortization of debt issuance costs	2	1	4	3
Capitalized interest	(2)	(9)	(6)	(17)
Loss (gain) on extinguishment of debt	140	(75)	140	(75)
Interest income	(1)	(3)	(3)	(7)
Financing costs, net	$ (34)	$ 173	$ 69	$ 270

Financing Costs, Net

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The amount of amortization of deferred charges applied against earnings during the period.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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