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Long-Term Debt (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Summary showing division of total long term debt
Unsecured obligations	$ 840	$ 846
Obligations secured by real estate	64	65
Other secured borrowings	30	41
Long-term Debt	$ 934	$ 952

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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