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Accounting Policies (Details) (USD $) In Billions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 M
Fair Value of Financial Instruments
Minimum initial maturities of short-term investments (in months)	3
Carrying amount of long-term debt	$ 9.2
Estimated fair value of long-term debt	$ 10.6

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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