XML 63 R36.htm IDEA: XBRL DOCUMENT
v3.21.1

Significant accounting policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Accounting Policies [Abstract] |
Estimated Useful Lives of Depreciable Assets | The ranges of estimated useful lives and the weighted average useful lives are summarized below:
| Range of useful lives |  | Weighted average useful lives
| 2020 |  | 2019 |  | 2020 |  | 2019
Generation | 3 - 60 |  | 3 - 60 |  | 33 |  | 33
Distribution | 1 - 100 |  | 5 - 100 |  | 40 |  | 42
Equipment | 5 - 50 |  | 5 - 44 |  | 11 |  | 10

X
- Definition Schedule Of Property Plant And Equipment Estimated Useful Lives. + References No definition available. + Details
Name: | aqunf_ScheduleOfPropertyPlantAndEquipmentEstimatedUsefulLivesTableTableTextBlock
Namespace Prefix: | aqunf_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration