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Investments in Debt and Equity Securities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Investments [Line Items]    
Short-term investments $ 280 $ 333
Trading Securities 19 33
Auction Rate Securities [Member]
   
Schedule of Investments [Line Items]    
Fair value of investments $ 26 [1] $ 29 [1]
[1] Included in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.