LEASES - SUPPLEMENTAL BALANCE SHEET (Details) $ in Millions	Dec. 31, 2019 USD ($) Rate
Operating Leased Assets [Line Items]
Operating Lease, Right-of-Use Asset	$ 903
Operating Lease, Liability, Current	251
Operating Lease, Liability, Noncurrent	676
Operating Lease, Liability	$ 927
Operating Lease, Weighted Average Remaining Lease Term	6 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent | Rate	4.60%