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REVENUE RECOGNITION - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Contract assets, current $ 651 $ 622
Contract assets, non-current (included within Other assets) 90 57
Total contract assets 741 679
Contract liabilities, current (485) (443)
Contract liabilities, non-current (included within Other long-term liabilities) (168) (168)
Total contract liabilities (653) (611)
Net contract assets $ 88 $ 68