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Acquisitions and Investments (Details 1) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Business Acquisition [Line Items]      
Fair value of assets acquired, net of cash acquired $ 1,517    
Cash paid, net of cash acquired 1,038 556 573
Liabilities assumed, debt issued and minority interest 479    
Excess purchase price over fair value of net assets acquired 377    
Other Acquisitions [Member]
      
Business Acquisition [Line Items]      
Fair value of assets acquired, net of cash acquired 470 850 871
Cash paid, net of cash acquired (334) (556) (573)
Liabilities assumed, debt issued and minority interest 136 294 298
Excess purchase price over fair value of net assets acquired $ 178 $ 298 $ 198