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Long-Term Debt (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary showing division of total long-term debt
Unsecured obligations	$ 872	$ 840
Obligations secured by real estate	62	64
Other secured borrowings	19	30
Long-term Debt	$ 953	$ 934

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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