Property, Plant and Equipment, Net - NPC (Details) - NPC - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Property, Plant and Equipment [Line Items]
Plant, net	$ 9,126	$ 9,028
Construction work-in-progress	1,479	1,395
Property, plant and equipment, net	10,605	10,423
Regulated
Property, Plant and Equipment [Line Items]
Generation	5,587	5,542
Distribution	1,886	1,886
Transmission	5,115	5,031
Intangible plant and other	998	951
Utility plant in-service	13,586	13,410
Accumulated depreciation and amortization	(4,461)	(4,383)
Plant, net	$ 9,125	9,027
Regulated \| Minimum
Property, Plant and Equipment [Line Items]
Useful life, generation	30 years
Useful life, distribution	55 years
Useful life, transmission	24 years
Useful life, other	5 years
Regulated \| Maximum
Property, Plant and Equipment [Line Items]
Useful life, generation	65 years
Useful life, distribution	75 years
Useful life, transmission	70 years
Useful life, other	65 years
Nonregulated
Property, Plant and Equipment [Line Items]
Useful life, other	40 years
Plant, net	$ 1	$ 1

Public Utilities, Property, Plant And Equipment, Net, Excluding Construction Work In Progress

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- Definition

Public Utilities, Property, Plant And Equipment, Plant In Service, Excluding Construction Work In Progress

+ 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

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Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility.

+ References

No definition available.

+ Details

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- Definition

Period end amount of construction work in progress in public utility.

+ References

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- Definition

Period end amount of property, plant and equipment (PPE) related to utility distribution.

+ References

No definition available.

+ Details

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- Definition

Useful life of utility distribution assets owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Period end amount of property, plant and equipment (PPE) related to generation or processing owned by public utility.

+ References

No definition available.

+ Details

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- Definition

Useful life of utility generation assets owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Period end amount of total net PPE.

+ References

No definition available.

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- Definition

Period end book value of other property, plant and equipment (PPE) owned (but not classified elsewhere) by the public utility.

+ References

No definition available.

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Useful life of other property, plant and equipment (PPE) owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Period end amount of property, plant and equipment (PPE) related to utility transmission owned by public utility.

+ References

No definition available.

+ Details

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- Definition

Useful life of utility transmission equipment owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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