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TAXES - Changes in Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Changes in unrecognized tax benefits      
Beginning balance $ 139 $ 164 $ 158
Current year increases 15 7 22
Prior year decreases (8) (28) (12)
Decrease for lapse in statute (2) (2) (4)
Decrease for lapse in statute (97) (2)  
Ending balance $ 47 $ 139 $ 164