SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION Interest Income and Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Supplemental Income Statement Elements [Abstract]
Interest expense	$ 117	$ 148	$ 358	$ 467
Interest income	24	36	116	122
Capitalized interest costs	$ 3	$ 9	$ 8	$ 27