COMMITMENTS: Level 4 (Details) $ in Millions	1 Months Ended	3 Months Ended
Mar. 31, 2022 USD ($)	Mar. 31, 2022 USD ($) long-termPurchaseObligation
Idaho Power Company [Member]
Guarantor Obligations
IERCo guarantee of BCC reclamation obligation	$ 51.0	$ 51.0
Idaho Power Company [Member] \| Solar Facility Purchase Commitment
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Number Of Long-term Purchase Obligations Acquired \| long-termPurchaseObligation		1
Idaho Power Company [Member] \| Cogeneration And Power Production Purchase Commitment Member
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Number Of Long-term Purchase Obligations Acquired \| long-termPurchaseObligation		1
Increase of Long-term Purchase Obligations, PURPA	86.0	$ 86.0
Long-term Purchase Commitment, Period		20 years
Idaho Power Company [Member] \| Contracts To Acquire And Own Battery Storage Assets Commitment
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Increase of Long-term Purchase Obligations, PURPA	137.0	$ 137.0
Long-term Purchase Commitment, Period		1 year
Payments to Acquire Productive Assets	26.0
Bridger Coal Company
Guarantor Obligations
IERCo guarantee of BCC reclamation obligation	153.0	$ 153.0
Guarantor Obligations Total Reclamation Trust Fund	$ 202.2	202.2
Distribution from Reclamation Trust Fund		$ 1.0

Distribution from Reclamation Trust Fund related to the guarantee obligation that exists at the balance sheet date.

No definition available.

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- Definition

Total reclamation trust fund balance related to the guarantee obligation that exists at the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

The estimated amount the entity agreed to spend under a long-term purchase obligation.

+ References

No definition available.

+ Details

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- Definition

Number Of Long-term Purchase Obligations Acquired

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

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- References

No definition available.

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- Definition

Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123362884&loc=d3e9212-128498

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123362884&loc=d3e9215-128498

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123385561&loc=d3e9135-128495

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