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CONSOLIDATED DEBT Equipment Financing Arrangements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Proceeds from borrowings on long-term debt $ 80 $ 1,165 $ 400
Long-term Debt 2,383 2,342  
Equipment Financing [Member]      
Debt Instrument [Line Items]      
Proceeds from borrowings on long-term debt 31    
Long-term Debt 85 $ 59  
2020 7    
2021 7    
2022 7    
2023 8    
2024 7    
Thereafter $ 49    
Equipment Financing [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.75%    
Equipment Financing [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.55%