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Long-Term Debt (Details) (USD $) In Billions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Carrying Amount of Long-term Debt [Member]
Long Term Debt (Textual) [Abstract]
Carrying Amount of long-term debt	$ 4.1	$ 4.1
Fair Value of Long-term Debt [Member]
Long Term Debt (Textual) [Abstract]
Carrying Amount of long-term debt	4.9	4.9
Level 1 [Member]
Long Term Debt (Textual) [Abstract]
Fair Value of Corporate bonds and certain other bonds	4.0
Level 2 [Member]
Long Term Debt (Textual) [Abstract]
Fair Value of Corporate bonds and certain other bonds	$ 0.9

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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