DEBT AND FINANCING COSTS - Components of Financing Costs, Net (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Debt Disclosure [Abstract]
Interest expense	$ 112	$ 107
Amortization of debt issuance costs	2	2
Capitalized interest	(2)	(4)
Interest income	(2)	(2)
Financing costs, net	$ 110	$ 103

Financing Costs, Net

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Amount of amortization expense attributable to debt issuance costs.

+ References

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

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

+ References

No definition available.

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
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-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870

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

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-Name Accounting Standards Codification
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