Debt (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Senior unsecured notes outstanding	$ 1,249,281,000	$ 1,249,221,000
Accrued interest related to senior notes	31,000,000	32,000,000
7.456% Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Senior unsecured notes outstanding	500,000,000	500,000,000
Senior notes, maturity date	August 2018
Senior notes, interest rate	7.456%
Redemption at option of holder	Repayable in whole or in part on August 15, 2013, at the option of the holders, at 100% of the principal amount plus accrued interest
Redemption at option of Company	We may redeem the 7.456% Notes at a redemption price of 100% of the principal plus accrued interest, plus a "make-whole" premium, in whole or in part at any time at our option
Senior notes redemption price percentage at the option of holder	100.00%
Fair value of senior notes	563,000,000	561,000,000
5.95% Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Senior unsecured notes principal amount	750,000,000
Senior unsecured notes outstanding	749,281,000	749,221,000
Senior notes, maturity date	August 2020
Senior notes, interest rate	5.95%
Senior notes issued price percentage	99.893%
Redemption at option of Company	We may redeem the 5.95% Notes at our option in whole or in part at any time or from time to time at a specified "make-whole" premium
Fair value of senior notes	760,000,000	743,000,000
8.5% Senior Notes Due 2016 [Member]
Debt Instrument [Line Items]
Senior unsecured notes principal amount	400,000,000	400,000,000
Senior notes, maturity date	2016
Senior notes, interest rate	8.50%
Prior Credit Facility [Member]
Debt Instrument [Line Items]
Unsecured revolving credit facility	1,000,000,000
Credit Facility [Member]
Debt Instrument [Line Items]
Unsecured revolving credit facility	750,000,000
Interest, on drawn amount	LIBOR plus 150 basis points
Commitment fee on undrawn amounts	22.5 basis points
Line of credit, outstanding	0	0
Line of credit facility, maturity date	August 2016
Letters of credit issued under the credit facility	$ 22,000,000	$ 27,000,000

Accrued Interest Senior Notes

No definition available.

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- Definition

Maturity date.

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No definition available.

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- Definition

Redemption at option of Company

+ References

No definition available.

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- Definition

Redemption at option of holder.

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No definition available.

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- Definition

Senior notes redemption price percentage at the option of holder.

+ References

No definition available.

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- Definition

Senior Notes Issued Price Percentage

+ References

No definition available.

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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-Name Regulation S-X (SX)

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-Section 03

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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-Publisher FASB

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-SubTopic 10

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-Paragraph 10

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- Definition

Interest rate stated in the contractual debt agreement.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

Description of the fees for amounts available, but unused under the credit facility.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

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- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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-Subparagraph (SX 210.5-02.22)

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