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, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitments and Contingencies [Abstract]      
Operating Leases, Future Minimum Payments Due, Current $ 46    
Operating Leases, Rent Expense, Net 56 46 38
Operating Leases, Future Minimum Payments, Due in Two Years 35    
Operating Leases, Future Minimum Payments, Due in Three Years 31    
Operating Leases, Future Minimum Payments, Due in Four Years 25    
Operating Leases, Future Minimum Payments, Due in Five Years 28    
Operating Leases, Future Minimum Payments, Due Thereafter $ 141