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LEASES - Supplement Balance Sheet Information (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent us-gaap:OtherAssetsNoncurrent
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Operating $ 38 $ 59
Finance 1 2
Total leased assets 39 61
Operating 6 27
Finance 1 1
Operating 35 37
Finance 0 1
Total lease liabilities $ 42 $ 66