SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION Interest Income and Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Supplemental Income Statement Elements [Abstract]
Interest expense	$ 177	$ 183	$ 361	$ 363
Interest income	55	50	106	95
Capitalized interest costs	$ 9	$ 9	$ 14	$ 17