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Debt - Schedule of Future Minimum Principal Payment Obligations (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Debt Disclosure [Abstract]
2015	$ 40
2016	260
Total	$ 300us-gaap_LongTermDebt

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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