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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis) (Details) (USD $)
In Millions
Sep. 30, 2010
Jun. 30, 2010
Assets held for sale, carrying value $ 11
Gains (Losses)(4) 
Fair Value, Inputs, Level 1 [Member]
  
Assets held for sale  
Fair Value, Inputs, Level 2 [Member]
  
Assets held for sale  
Fair Value, Inputs, Level 3 [Member]
  
Assets held for sale$ 7