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Commitments and Contingencies (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Loss Contingency [Abstract]      
Loss contingency estimate $ 2,300    
Warranty [Abstract]      
Product warranty reserve, beginning balance 4,785 $ 3,927  
Payments made during the period (2,036) (2,186)  
Changes in accrual related to warranties issued during the period 1,523 1,506  
Changes in accrual related to pre-existing warranties 495 1,522  
Foreign currency translation and other (192) (67)  
Product warranty reserve, ending balance 4,575 $ 4,702  
Affiliated Entity [Member]      
Guarantees [Abstract]      
Maximum potential payments 392   $ 592
Carrying value of recorded liabilities related to guarantees and indemnifications $ 16   $ 17