OTHER FINANCIAL DATA - U.S. TREASURY GRANT RECEIVABLE (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
U.S. Treasury Grants Receivable [Line Items]
Proceeds from U.S. Treasury grants		$ 0	$ 0	$ 238
Reduction in tax benefit due to sequestration	$ 5
Sequestration of U.S. Treasury grants receivable		$ 0	$ 0	$ 23