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Long-Term Debt - Schedule of Fair Value of Debt (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Total debt at par value	$ 9,469us-gaap_DebtInstrumentCarryingAmount	$ 11,228us-gaap_DebtInstrumentCarryingAmount
Unamortized discount, net	(90)	(383)
Net carrying amount	9,379us-gaap_LongTermDebt	10,845us-gaap_LongTermDebt
Debt instrument, fair value disclosure	$ 9,800us-gaap_DebtInstrumentFairValue	$ 11,600us-gaap_DebtInstrumentFairValue

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- 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.

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