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Organization and Basis of Presentation (Non Consolidated Variable Interest Entities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]    
Notes receivable $ 102 $ 112
Variable Interest Entity, NonConsolidated [Member]
   
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]    
Other investments 141 130
Notes receivable $ 8 $ 6