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LEASES 2 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease cost $ 214 $ 222
Variable lease cost 18 27
Short-term lease cost 17 12
Amortization of right-of-use assets 69 65
Interest on lease liability 27 30
Total finance lease cost 96 95
Total lease cost $ 345 $ 356