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Contingencies - Schedule of Product Warranty Liability (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]    
Beginning warranty reserve $ 14,753 $ 11,821
Warranty payments (315) (550)
Warranty claims 1,217 2,116
Provision for product warranties (392) (1,366)
Ending warranty reserve $ 15,263 $ 14,753