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ACQUISITIONS AND DISPOSITIONS - Pro Forma Results of Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Business Acquisition [Line Items]      
Revenue   $ 2,837 $ 2,246
Net income (loss)   6 (251)
Net income (loss) attributable to common shareholders   $ 0 $ (264)
EARNINGS (LOSS) PER SHARE ATTRIBUTABLE TO COMMON SHAREHOLDERS      
Basic (in usd per share)   $ 0.01 $ (6.40)
Diluted (in usd per share)   $ 0.01 $ (6.40)
Welk      
Business Acquisition [Line Items]      
Revenue $ 53 $ 101  
Net income (loss) $ 10 $ 16