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DEBT - Fair Value (Details) - USD ($)
$ in Billions
Dec. 31, 2019
Dec. 31, 2018
Carrying Value Reported Value Measurement    
Debt Instrument [Line Items]    
Debt, long-term and short-term $ 2.8 $ 3.0
Estimate of Fair Value Measurement    
Debt Instrument [Line Items]    
Estimated market value of long-term and short-term debt $ 3.0 $ 3.0