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LEASES - Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets    
Finance leases $ 1 $ 1
Operating leases 176 159
Total right-of-use assets 177 160
Current Liabilities:    
Operating leases 48 44
Noncurrent liabilities    
Finance leases 1 1
Operating leases 130 120
Total lease liabilities $ 179 $ 165
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Weighted-average discount rate    
Finance leases 3.70% 3.60%
Operating leases 3.00% 2.90%
Weighted-average remaining lease term in years    
Finance leases 6 years 6 months 7 years
Operating leases 5 years 2 months 12 days 5 years 3 months 18 days