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Commitments and Contingencies (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Loss Contingency [Abstract]      
Loss contingency estimate $ 2,800    
Warranty [Abstract]      
Product warranty reserve, beginning balance 4,558 $ 4,785  
Payments made during the period (1,593) (1,229)  
Changes in accrual related to warranties issued during the period 1,179 1,005  
Changes in accrual related to pre-existing warranties 279 212  
Foreign currency translation and other 45 (68)  
Product warranty reserve, ending balance 4,468 $ 4,705  
Affiliated Entity [Member]      
Guarantees [Abstract]      
Maximum potential payments 200   $ 284
Carrying value of recorded liabilities related to guarantees and indemnifications $ 23   $ 23