Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES - PURCHASE COMMITMENTS AND OPERATING LEASES (Details)

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COMMITMENTS AND CONTINGENCIES - PURCHASE COMMITMENTS AND OPERATING LEASES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
COMMITMENTS AND CONTINGENCIES      
Minimum contracts period which require minimum volume purchases 1 year    
Minimum payments under purchase commitments $ 1 $ 0 $ 0
Purchase commitments:      
2020 1,364    
2021 905    
2022 751    
2023 424    
2024 416    
Thereafter 1,894    
Total $ 5,754    
Operating Leases      
Lease expense   $ 55 $ 60