SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION Interest Income and Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Supplemental Income Statement Elements [Abstract]
Interest expense	$ 198	$ 181	$ 571	$ 513
Interest income	46	49	140	129
Capitalized interest costs	$ 6	$ 7	$ 18	$ 21