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Commitments and Contingencies (Schedule of Product Warranty Reserves) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Balance at January 1 $ 235 $ 191    
Issuances/accruals during the period 474 194    
Settlements made during the period (203) (206)    
Balance at September 30 506 179    
Current portion     $ 326 $ 141
Non-current portion     180 38
Total $ 235 $ 191 $ 506 $ 179