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Contingencies - Schedule of Product Warranty Liability (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 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 (57) (550)
Warranty claims 405 2,116
Provision for product warranties (143) (1,366)
Ending warranty reserve $ 14,958 $ 14,753