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Fair Value Measurements (Details 4) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Carrying Value
   
Approximate fair value and related carrying amounts of notes receivable    
Notes receivable $ 0 $ 7
Fair Value
   
Approximate fair value and related carrying amounts of notes receivable    
Notes receivable 0 8
TE | Carrying Value
   
Approximate fair value and related carrying amounts of notes receivable    
Notes receivable 81 [1] 104 [1]
TE | Fair Value
   
Approximate fair value and related carrying amounts of notes receivable    
Notes receivable $ 92 [1] $ 118 [1]
[1] Represents TE's investment in the Shippingport Trust notes (see Note 6, Leases), which is eliminated during consolidation.