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Fair Value Of Financial Assets And Liabilities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Investments in available-for-sale securities, fair value $ 71 [1] $ 118 [1]
Available-for-sale auction rate securities, carrying value 190  
Investments in auction rate securities sold 59  
Auction Rate Securities [Member]
   
Investments in available-for-sale securities, fair value 89 149
Available-for-sale auction rate securities, carrying value $ 71 $ 118
[1] Included in Other within Investments and Other Assets on the Consolidated Balance Sheets.