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Commitments and Contingencies (Schedule of Product Warranty Reserves) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at January 1 $ 191 $ 187
Issuances/accruals during the period 194 204
Settlements made during the period (206) (199)
Balance at September 30 179 192
Current portion 141 147
Non-current portion 38 45
Total $ 179 $ 192