SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Disclosure Text Block Supplement [Abstract]
Temporary investments	$ 879		$ 738
Allowance for doubtful accounts	69		70
Accumulated depreciation	21,000		$ 20,700
Depreciation expense	267	$ 304
Interest payments	$ 136	$ 129