Basis of Presentation and Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 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	$ 26	$ 40
Electronic Health Records Incentive Reimbursement, Cash Received	54	62
Electronic Health Records Incentive Reimbursements [Member]
Electronic Health Records Reimbursement, Policy [Abstract]
Deferred Revenue	$ 75	$ 93

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Total amount recognized for electronic health record (EHR) incentive reimbursements from the government related to the implementation of EHRs meeting the "meaningful use" criteria.

+ References

No definition available.

+ Details

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- Details

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- Definition

Cash inflow from the EHR incentive reimbursement related to the implementation of electronic health records.

+ References

No definition available.

+ Details

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- Definition

Period from the date of discharge over which all patient accounts receivable gross, current, are reserved for in allowance for bad debts for a specific period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

The percentage for which all patient accounts receivable gross, current, are reserved for at 100% as allowance for bad debts.

+ References

No definition available.

+ Details

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- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)

-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

+ Details

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- Details

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