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FAIR VALUES MEASUREMENTS - Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current and long-term debt (excluding finance leases), carrying amount $ 11,247 $ 319
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current and long-term debt (excluding finance leases), carrying amount 11,241 313
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current and long-term debt (excluding finance leases), fair value 10,634 313
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current and long-term debt (excluding finance leases), fair value 8,565 0
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current and long-term debt (excluding finance leases), fair value 0 0
Fair Value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current and long-term debt (excluding finance leases), fair value $ 2,069 $ 313