v2.4.0.8

Debt (Consolidated Debt) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 2,685,287,000	$ 2,393,408,000
Long-term Debt, Weighted Average Interest Rate	5.20%
Debt Instrument, Face Amount	2,700,000,000.0	2,400,000,000.0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt	0	0
Long-term Debt, Weighted Average Interest Rate	0.00%
6.45% Notes Due 2014 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	249,971,000	249,905,000
Long-term Debt, Weighted Average Interest Rate	6.30%
Debt Instrument, Face Amount	250,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.45%
5.65% Notes Due 2016 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	251,183,000	251,609,000
Long-term Debt, Weighted Average Interest Rate	5.70%
Debt Instrument, Face Amount	250,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.65%
6.40% Notes Due 2018 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	259,346,000	261,411,000
Long-term Debt, Weighted Average Interest Rate	5.40%
Debt Instrument, Face Amount	250,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.40%
6.55% Notes Due 2019 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	571,515,000	575,065,000
Long-term Debt, Weighted Average Interest Rate	5.70%
Debt Instrument, Face Amount	550,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.55%
4.25% Notes Due 2021 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	557,213,000	558,088,000
Long-term Debt, Weighted Average Interest Rate	4.00%
Debt Instrument, Face Amount	550,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.25%
6.40% Notes Due 2037 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	248,998,000	248,981,000
Long-term Debt, Weighted Average Interest Rate	6.40%
Debt Instrument, Face Amount	250,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.40%
4.20% Notes Due 2042 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	248,377,000	248,349,000
Long-term Debt, Weighted Average Interest Rate	4.20%
Debt Instrument, Face Amount	250,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.20%
5.15% Notes Due 2043 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	298,684,000
Long-term Debt, Weighted Average Interest Rate	5.20%
Debt Instrument, Face Amount	$ 300,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.15%

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 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 210.5-02.22(a)(1))

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

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X

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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 210.5-02.22)

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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

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X

- Definition

Weighted average interest rate of long-term debt outstanding.

+ References

No definition available.

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