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REVENUE RECOGNITION - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]    
Contract assets, current $ 503 $ 656
Contract assets, non-current (included within Other assets) 70 98
Total contract assets 573 754
Contract liabilities, current (415) (512)
Contract liabilities, non-current (included within Other long-term liabilities) (165) (165)
Total contract liabilities (580) (677)
Net contract assets (liabilities) $ (7) $ 77