SUPPLEMENTAL FINANCIAL INFORMATION - Other Non-Current Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Voluntary Separation Program (c)	$ 61	$ 147
Postretirement obligation	269	241
Other deferred compensation	358	331
Other	293	250
Other noncurrent liabilities	981	969
COVID - 19
Unusual or Infrequent Item, or Both [Line Items]
Accrued expenses	$ 93	$ 109		$ 1,400
Credit expense			$ 140
Proceeds from PSP2 payroll support program			$ 2,700