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RESTATEMENT OF PREVIOUSLY ISSUED FINANCIAL STATEMENTS (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 15, 2014
Revenue Recognition Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reduction of revenue	$ 21	$ 58
Increase in net income	$ 24
Increase in diluted earnings per share (in dollars per share)	$ 0.07
Provision for managed care rebates	$ 21
Reduction of pre-tax profit		$ 39
Philidor
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Percentage of interest acquired			100.00%