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Fair Value Measurements (Fair Value of Long-Term Debt Recorded at Carrying Value) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Fair Value of Long-Term Debt Recorded at Carrying Value
Long-term debt, including current portion, Carrying Value	$ 14,192	$ 13,746
Long-term debt, including current portion, Fair Value	$ 14,194	$ 14,264

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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