Basis of Presentation and Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Allowance for Doubtful Accounts, Policy [Abstract]
Percentage reserved for all non-self-pay payors accounts aging over 365 days from the date of discharge			100.00%
Number of days from the date of discharge over which all accounts are reserved 100%			365 days
Electronic Health Records Reimbursement, Policy [Abstract]
Electronic health records incentive reimbursement under HITECH	$ 55	$ 84	$ 81	$ 124
Electronic Health Records Incentive Reimbursement, Cash Received	10	25	65	87
Electronic Health Records Incentive Reimbursements [Member]
Electronic Health Records Reimbursement, Policy [Abstract]
Deferred Revenue	$ 21	$ 15	$ 21	$ 15