Earliest date before maturity when the issuer can call the outstanding debt instrument for repayment or conversion to equity, in CCYY-MM-DD format.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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-Name Accounting Principles Board Opinion (APB)

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Interest rate stated in the contractual debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Publisher SEC

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Date the debt instrument was offered for sale, in CCYY-MM-DD format.

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-Name Regulation S-X (SX)

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The cash outflow to pay off an obligation from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity.

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Initial increase in interest rate after registration default

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Issure price of debt instrument as percentage of face amount

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Maximum increase in interest rate after registration default

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Maximum percentage of Senior Notes redemmable on or before May 1, 2018

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Redemption price, stated as a percentage of the face amount, for Senior Notes redeemed at the request of the holder due to a change of control of the Company

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Redemption Price Percentage For Redemption On Before 2018

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Subsequent increase in interest rate after registration default

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Subsequent Event Subsequent Event (Details) (USD $)	1 Months Ended
Subsequent Event Subsequent Event (Details) (USD $)	Apr. 30, 2013 Rate	Aug. 31, 2007	Apr. 16, 2013 Rate	Aug. 15, 2007 Rate
Subsequent Events [Abstract]
Debt Instrument, Offering Date	Apr. 16, 2013
Debt Instrument, Face Amount			$ 750,000,000	$ 1,250,000,000
Debt Instrument, Interest Rate, Stated Percentage			4.625%	3.25%
Debt Instrument, Maturity Date	May 01, 2023	Aug. 15, 2037
Percentage of notes issued			100.00%
Repayments of Lines of Credit	$ 100,000,000
Debt Instrument, Call Date, Earliest	May 01, 2018
Max early redemption percentage of the debt instrument	35.00%
Redemption Price Percentage For Redemption On Before 2018	105.00%
Redemption Price Of Senior Notes If Change Of Control	101.00%
Initial increase in interest rate after registration default	0.25%
Subsequent increase in interest rate after registration default	0.25%
Maximum increase in interest rate after registration default	1.00%