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CONSOLIDATED DEBT Equipment Financing Arrangements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Debt Instrument [Line Items]    
Long-term debt $ 2,383 $ 2,414
Minimum [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.55%  
Equipment Financing [Member]    
Debt Instrument [Line Items]    
Proceeds from borrowings on long-term debt $ 31  
Long-term debt $ 85 78
2020   7
2021   7
2022   8
2023   7
2024   5
Thereafter   $ 44
Equipment Financing [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.75%