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Contingencies Warranty Reserve (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 111.1      
Standard and Extended Product Warranty Accrual 14,753.0 $ 11,821.0 $ 10,296.0 $ 9,438.0
Standard Product Warranty Accrual, Increase for Warranties Issued 1,566.0 950.0 1,203.0  
Standard and Extended Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties $ 1,366.0 $ 2,475.0 $ (345.0)