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LEASES - Future Minimum Lease Commitments (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Remainder of 2019 $ 234
2020 175
2021 147
2022 117
2023 96
Thereafter 474
Total 1,243
Less: imputed interest 182
Total, less imputed interest $ 1,061