Revenue (Performance Obligations) (Details)	12 Months Ended
	Dec. 31, 2018
Motorcycles | Licensing
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Sale Payment Terms	30 days
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	6 years
Financial Services | Other income
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	5 years
Minimum | Motorcycles | Motorcycles
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Sale Payment Terms	30 days
Minimum | Motorcycles | Parts & Accessories
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Sale Payment Terms	30 days
Minimum | Motorcycles | General Merchandise
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Sale Payment Terms	30 days
Maximum | Motorcycles | Motorcycles
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Sale Payment Terms	120 days
Maximum | Motorcycles | Parts & Accessories
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Sale Payment Terms	120 days
Maximum | Motorcycles | General Merchandise
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Sale Payment Terms	120 days