Basis of Presentation and Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014 item	Jun. 30, 2013	Jun. 30, 2014 item	Jun. 30, 2013
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	$ 84		$ 24	$ 124	$ 43
Electronic Health Records Incentive Reimbursement, Cash Received	25		38	87	83
Discontinued Operations [Abstract]
Number of hospitals required to be divested by the Federal Trade Commission		2		2
Electronic Health Records Incentive Reimbursements [Member]
Electronic Health Records Reimbursement, Policy [Abstract]
Deferred Revenue	$ 15		$ 50	$ 15	$ 50