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Debt Obligations - Narrative (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Term Loan Due August 2013
Debt Instrument
Long term debt, face amount	$ 250,000,000
Estimate of Fair Value, Fair Value Disclosure
Debt Instrument
Debt Instrument, Fair Value Disclosure	1,810,000,000	1,810,000,000
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Debt Instrument
Long term debt, amount outstanding	$ 1,750,000,000	$ 1,760,000,000
Panhandle [Member] \| Term Loan 2015 [Member]
Debt Instrument
Debt, Weighted Average Interest Rate	1.83%

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.

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