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LEASES - Assets and Liabilities, Lessee (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Weighted-average remaining lease terms (years)    
Operating leases 8 years 6 months 18 days 9 years 5 months 1 day
Finance leases 7 years 8 months 26 days 4 years 7 months 13 days
Weighted-average discount rate    
Operating leases 4.21% 4.51%
Finance leases 11.58% 10.45%
Assets    
Operating lease $ 265 $ 231
Finance lease 57 73
Total leased assets 322 304
Current:    
Operating 42 32
Finance 14 15
Noncurrent:    
Operating 263 241
Finance 31 45
Total leased liabilities 350 333
Operating lease assets, accumulated amortization 51 23
Financing lease, accumulated amortization $ 96 $ 90
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets us-gaap:OtherAssets
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesCurrent