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Commitments and Contingencies - Warranty Reserve (Details) (USD $)
In Millions
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Product Liability Contingency [Line Items]  
Warranty reserve liability, beginning balance$ 24$ 25
Warranty reserve liability, accruals for warranties issued2833
Warranty reserve liability, settlements (in cash or in kind)(32)(35)
Warranty reserve liability, ending balance$ 20$ 23