Fair Value of Financial Instruments (Schedule of Estimated Fair Value of Financial Instruments, by Balance Sheet Grouping) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Available-for-sale securities	$ 280us-gaap_AvailableForSaleSecurities	$ 65us-gaap_AvailableForSaleSecurities
Trading securities	55us-gaap_TradingSecurities	38us-gaap_TradingSecurities
Liabilities:
Contingent Value Right, Fair Value Disclosure	6cyh_ContingentValueRight
Carrying Amount Measurement [Member]
Assets:
Cash and cash equivalents	509	373
Available-for-sale securities	280	65
Trading securities	55	38
Liabilities:
Contingent Value Right, Fair Value Disclosure	6
Carrying Amount Measurement [Member] \| Credit Facility, Type of Debt [Member] \| Credit Facility, Name [Member]
Liabilities:
Credit Facility, Fair Value Disclosure	7,165	4,050
Carrying Amount Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 8.0, Due 2019 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	2,018	2,020
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
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
Carrying Amount Measurement [Member] \| Receivables Facility and Other Debt, Type [Member] \| Receivables Facility and Unsecured Debt [Member]
Liabilities:
Other Liabilities, Fair Value Disclosure	705	537
Estimate of Fair Value Measurement [Member]
Assets:
Cash and cash equivalents	509	373
Available-for-sale securities	280	65
Trading securities	55	38
Liabilities:
Contingent Value Right, Fair Value Disclosure	6
Estimate of Fair Value Measurement [Member] \| Credit Facility, Type of Debt [Member] \| Credit Facility, Name [Member]
Liabilities:
Credit Facility, Fair Value Disclosure	7,143	4,085
Estimate of Fair Value Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 8.0, Due 2019 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	2,139	2,172
Estimate of Fair Value Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 7.125, Due 2020 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	1,282	1,246
Estimate of Fair Value Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 6.875, Due 2022 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	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	1,662
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	1,041
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	$ 705	$ 537

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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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-Name Accounting Standards Codification

-Topic 320

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-Paragraph 5

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-Name Accounting Standards Codification

-Topic 320

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-Section 45

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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

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-Name Accounting Standards Codification

-Glossary Cash Equivalents

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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.

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- 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

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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

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- Definition

Fair value portion of other liabilities.

+ References

No definition available.

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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

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-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

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-Name Accounting Standards Codification

-Topic 320

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-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)

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