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Fair Value Measurements (Narrative) (Details) (USD $)	12 Months Ended
Fair Value Measurements (Narrative) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Fair Value Measurements [Abstract]
Maximum maturity date of cash equivalents, in days	90 days or less
Estimated fair values of long-term debt instruments	$ 7,800,000,000	$ 6,200,000,000
Carrying amount of long-term debt instruments, excluding unamortized discount	7,000,000,000	5,500,000,000
Unamortized discount on long-term debt	$ 506,000,000	$ 505,000,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). 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.

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