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Investments, Advances And Long-Term Receivables (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Investments, Advances And Long-Term Receivables [Abstract]      
Investments (Companies carried at equity in underlying assets) $ 16,968 $ 17,429 $ 15,742
Advances (Companies carried at equity in underlying assets) 9,740 9,286  
Total equity company investments and advances 26,708 26,715  
Companies carried at cost or less and stock investments carried at fair value 1,544 1,557  
Long-term receivables and miscellaneous investments at cost or less, net of reserves of $469 million and $292 million 6,081 7,066  
Total 34,333 35,338  
Reserves for Long-term receivables and miscellaneous investments $ 469 $ 292