ACCOUNTS RECEIVABLE AND ALLOWANCE FOR DOUBTFUL ACCOUNTS (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable
Accounts receivable, net	$ 2,171	$ 1,965
Continuing operations
Accounts, Notes, Loans and Financing Receivable
Patient accounts receivable	2,949	2,537
Allowance for doubtful accounts	(753)	(589)
Estimated future recoveries from accounts assigned to our collection agency subsidiary	90	91
Net cost reports and settlements receivable (payable) and valuation allowances	(118)	(77)
Accounts receivable, net	2,168	1,962
Discontinued operations
Accounts, Notes, Loans and Financing Receivable
Accounts receivable, net	$ 3	$ 3