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LEASES - SUPPLEMENTAL BALANCE SHEET (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Rate
Operating Leased Assets [Line Items]  
Operating Lease, Right-of-Use Asset $ 887
Operating Lease, Liability, Current 263
Operating Lease, Liability, Noncurrent 630
Operating Lease, Liability $ 893
Operating Lease, Weighted Average Remaining Lease Term 7 years
Operating Lease, Weighted Average Discount Rate, Percent | Rate 4.30%