SHAREHOLDERS' EQUITY - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
SHAREHOLDERS' EQUITY
Cumulative translation adjustments	$ 245	$ 325
Unrealized loss on marketable securities, net	(12)	(12)
Unrealized loss on interest rate swaps	(16)	(18)
Unrecognized net loss and prior service cost, net	(382)	(406)
Accumulated other comprehensive loss	(165)	(111)
Income tax expense on unrealized loss on marketable securities	14	14
Income tax benefit on unrealized loss on interest rate swap securities	1	1
Income tax benefit on prior service cost and net loss	$ 186	$ 199