SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION Interest Income and Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Supplemental Income Statement Elements [Abstract]
Interest expense	$ 177	$ 184	$ 538	$ 547
Interest income	54	51	160	146
Capitalized interest costs	$ 7	$ 9	$ 21	$ 26