SUMMARY QUARTERLY INFORMATION (UNAUDITED) - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision for managed care rebates	$ 27
Revenue recognition correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reduction in net income		$ 24	$ 22	$ 24	$ 24	$ 33
Reduction in diluted earnings per share		$ 0.07	$ 0.06	$ 0.07	$ 0.07	$ 0.09
Restatement in revenue						$ 58
Provision for managed care rebates		$ 21
Reduction of pre-tax profit						$ 39