Fair Value of Financial Instruments (Schedule of Estimated Fair Value of Financial Instruments, by Balance Sheet Grouping) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets:
Available-for-sale securities	$ 285us-gaap_AvailableForSaleSecurities	$ 280us-gaap_AvailableForSaleSecurities
Trading securities	58us-gaap_TradingSecurities	55us-gaap_TradingSecurities
Liabilities:
Contingent Value Right, Fair Value Disclosure	6cyh_ContingentValueRight	6cyh_ContingentValueRight
Carrying Amount Measurement [Member]
Assets:
Cash and cash equivalents	222	509
Available-for-sale securities	285	280
Trading securities	58	55
Liabilities:
Contingent Value Right, Fair Value Disclosure	6	6
Carrying Amount Measurement [Member] \| Credit Facility, Type of Debt [Member] \| Credit Facility, Name [Member]
Liabilities:
Credit Facility, Fair Value Disclosure	7,231	7,165
Carrying Amount Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 8.0, Due 2019 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	2,017	2,018
Carrying Amount Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 7.125, Due 2020 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	1,200	1,200
Carrying Amount Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 6.875, Due 2022 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	3,000	3,000
Carrying Amount Measurement [Member] \| Senior Secured Notes [Member] \| Senior Secured Notes At 5.125 Due 2018 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	1,600	1,600
Carrying Amount Measurement [Member] \| Senior Secured Notes [Member] \| Senior Secured Notes at 5.125, Due 2021 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	1,000	1,000
Carrying Amount Measurement [Member] \| Receivables Facility and Other Debt, Type [Member] \| Receivables Facility and Unsecured Debt [Member]
Liabilities:
Other Liabilities, Fair Value Disclosure	706	705
Estimate of Fair Value Measurement [Member]
Assets:
Cash and cash equivalents	222	509
Available-for-sale securities	285	280
Trading securities	58	55
Liabilities:
Contingent Value Right, Fair Value Disclosure	6	6
Estimate of Fair Value Measurement [Member] \| Credit Facility, Type of Debt [Member] \| Credit Facility, Name [Member]
Liabilities:
Credit Facility, Fair Value Disclosure	7,249	7,143
Estimate of Fair Value Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 8.0, Due 2019 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	2,129	2,139
Estimate of Fair Value Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 7.125, Due 2020 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	1,277	1,282
Estimate of Fair Value Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 6.875, Due 2022 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	3,211	3,194
Estimate of Fair Value Measurement [Member] \| Senior Secured Notes [Member] \| Senior Secured Notes At 5.125 Due 2018 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	1,655	1,655
Estimate of Fair Value Measurement [Member] \| Senior Secured Notes [Member] \| Senior Secured Notes at 5.125, Due 2021 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	1,034	1,041
Estimate of Fair Value Measurement [Member] \| Receivables Facility and Other Debt, Type [Member] \| Receivables Facility and Unsecured Debt [Member]
Liabilities:
Other Liabilities, Fair Value Disclosure	$ 706	$ 705

Contingent Value Right

No definition available.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Fair value portion of notes payable.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20,22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of other liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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