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Other Financial Data (Gains On Sales Of Investments And Businesses) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Financial Data [Abstract]      
Gains on sales of investments, net $ 39 $ 17 $ 49
Gains on sales of businesses, net 0 6 0
Gain on sale of investments and businesses $ 39 $ 23 $ 49