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LEASES AND COMMITMENTS - Summary of lease obligations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Leases [Abstract] |  |
Operating leases | $ 27 | $ 152
Finance leases | 1 | 14
Total lease obligations | $ 28 | $ 166

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