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PROPERTY, PLANT AND EQUIPMENT AND OPERATING LEASES - Maturity of Lease Liabilities (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Property, Plant and Equipment [Abstract]  
2019 (excluding nine months ended September 30, 2019) $ 212
2020 769
2021 636
2022 530
2023 429
Thereafter 1,195
Total undiscounted lease payments 3,771
Less: imputed interest (602)
Total lease liability as of September 30, 2019 $ 3,169