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Long-Term Debt (Details 1) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary showing division of total long term debt
Unsecured obligations	$ 872	$ 872
Obligations secured by real estate	62	62
Other secured borrowings	16	19
Long-term Debt	$ 950	$ 953

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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