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Investments and Related Matters Other Segments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Investments [Line Items]    
Investments $ 9,604 $ 5,491
Other Segments [Member]
   
Schedule of Investments [Line Items]    
Equity method investments 311 299
Other investments 170 108
Investments $ 481 $ 407