Commitments and Contingencies - MEC (Details) - MEC $ in Millions	9 Months Ended
Sep. 30, 2021 USD ($)
Construction Commitment
Loss Contingencies [Line Items]
Purchase obligation	$ 405
Easements
Loss Contingencies [Line Items]
Purchase obligation	$ 87
Transmission
Loss Contingencies [Line Items]
Public utilities, approved return on equity adder	0.50%
Transmission \| Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Accrued liability for estimated transmission billings refunds	$ 9
Prior to September 2016 \| Transmission
Loss Contingencies [Line Items]
Public utilities, approved return on equity	12.38%
November 2013 to February 2015 \| Transmission
Loss Contingencies [Line Items]
Public utilities, approved return on equity	10.32%
Public utilities, intervenor proposed return on equity	9.15%
February 2015 through May 2016 \| Transmission
Loss Contingencies [Line Items]
Public utilities, intervenor proposed return on equity	8.67%
Nov 2019 Order For Nov 2013 to Feb 2015 and Sept 2016 Forward \| Transmission
Loss Contingencies [Line Items]
Public utilities, approved return on equity	9.88%
Public utilities, approved return on equity plus adder	10.38%
May 2020 Order For Nov 2013 to Feb 2015 and Sept 2016 Forward \| Transmission
Loss Contingencies [Line Items]
Public utilities, approved return on equity	10.02%
Public utilities, approved return on equity plus adder	10.52%

Percentage of public utility's approved return on equity adder.

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Percentage of a public utility's approved return on equity plus the approved equity adder.

+ References

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Percentage of public utility's return on equity as proposed by intervenor(s) to a proceeding.

+ References

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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.

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Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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Percentage of public utility's approved return on equity.

+ References

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- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

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