Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies detail (Details)

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Commitments And Contingencies detail (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Commitments and Contingencies [Abstract]      
Operating Leases, Future Minimum Payments Due, Current $ 40    
Operating Leases, Rent Expense, Net 46 38 36
Operating Leases, Future Minimum Payments, Due in Two Years 35    
Operating Leases, Future Minimum Payments, Due in Three Years 25    
Operating Leases, Future Minimum Payments, Due in Four Years 22    
Operating Leases, Future Minimum Payments, Due in Five Years 20    
Operating Leases, Future Minimum Payments, Due Thereafter $ 113