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PROPERTY, PLANT AND EQUIPMENT AND OPERATING LEASES - Supplemental Information Related to Operating Leases (Details)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Property, Plant and Equipment [Abstract]  
Operating cash flows used for operating leases $ 683
Right-of-use assets obtained in exchange for new lease liabilities $ 459
Weighted-average remaining lease term 6 years 9 months 18 days
Weighted-average discount rate 5.10%