FAIR VALUES MEASUREMENTS - Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current and long-term debt (excluding finance leases), carrying amount	$ 12,029	$ 319
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current and long-term debt (excluding finance leases), carrying amount	12,023	313
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current and long-term debt (excluding finance leases), fair value	12,116	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	10,004	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	$ 2,112	$ 313