SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION Interest Income and Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Supplemental Income Statement Elements [Abstract]
Interest expense	$ 186	$ 172	$ 373	$ 332
Interest income	49	43	94	80
Capitalized interest costs	$ 6	$ 7	$ 12	$ 14