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Commitments and Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Loss Contingency [Abstract]      
Loss contingency estimate $ 2,400    
Warranty [Abstract]      
Product warranty reserve, beginning balance 4,558 $ 4,785  
Payments made during the period (797) (576)  
Changes in accrual related to warranties issued during the period 612 463  
Changes in accrual related to pre-existing warranties 59 173  
Foreign currency translation and other 52 (145)  
Product warranty reserve, ending balance 4,484 $ 4,700  
Affiliated Entity [Member]      
Guarantees [Abstract]      
Maximum potential payments 240   $ 284
Carrying value of recorded liabilities related to guarantees and indemnifications $ 23   $ 23