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Ballard Power Systems Europe A/S non-controlling interests (Details) - USD ($) $ in Thousands			12 Months Ended
	Jan. 05, 2017	Jan. 04, 2017	Dec. 31, 2018	Dec. 31, 2017
Disclosure of subsidiaries [line items]
Payments from changes in ownership interests in subsidiaries that do not result in loss of control			$ 0	$ 47
Ballard Power Systems Europe NCI adjustment for change in ownership			$ 480	$ 480
Ballard Power Systems Europe A/S
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	57.00%	100.00%	100.00%
Proportion of ownership interest in subsidiary, purchase of additional interest, percentage	43.00%
Repayments of borrowings, classified as financing activities			$ 521
Payments from changes in ownership interests in subsidiaries that do not result in loss of control	$ 47		$ 47

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The increase (decrease) in equity through changes in ownership interests in subsidiaries that do not result in loss of control. [Refer: Subsidiaries [member]]

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