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Guarantees, Indemnities and Warranties (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Guarantees Indemnities and Warranties    
Warranty accrual - January 1 $ 27 $ 24
Warranty expense 8 13
Payments (9) (10)
Warranty accrual - December 31 $ 26 $ 27