SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION Interest Income and Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Supplemental Income Statement Elements [Abstract]
Interest expense	$ 148	$ 177	$ 467	$ 538
Interest income	36	54	122	160
Capitalized interest costs	$ 9	$ 7	$ 27	$ 21