Property, Plant and Equipment, Net - PAC (Details) - PAC - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Property, Plant and Equipment [Line Items]
Plant, net	$ 26,290		$ 27,783
Construction work-in-progress	3,635		3,330
Property, plant and equipment, net	29,925		31,113
Government grant, asset decrease	58		50
Government grant, operating expense decrease	2	$ 13
Regulated
Property, Plant and Equipment [Line Items]
Generation	14,272		15,114
Transmission	11,425		11,732
Distribution	10,587		11,127
Intangible plant and other	2,605		2,667
Utility plant in-service	38,889		40,640
Accumulated depreciation and amortization	(12,617)		(12,875)
Plant, net	$ 26,272		27,765
Regulated \| Minimum
Property, Plant and Equipment [Line Items]
Useful life, generation	15 years
Useful life, transmission	60 years
Useful life, distribution	20 years
Useful life, other	2 years
Regulated \| Maximum
Property, Plant and Equipment [Line Items]
Useful life, generation	59 years
Useful life, transmission	90 years
Useful life, distribution	75 years
Useful life, other	75 years
Nonregulated
Property, Plant and Equipment [Line Items]
Plant, net	$ 18		$ 18
Nonregulated \| Minimum
Property, Plant and Equipment [Line Items]
Useful life, other	34 years
Nonregulated \| Maximum
Property, Plant and Equipment [Line Items]
Useful life, other	75 years

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.

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- Definition

Amount of decrease in asset from government assistance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 832
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483507/832-10-50-3

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Amount of decrease (increase) in expense from government assistance, classified as operating.

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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.

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No definition available.

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

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- Definition

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

+ References

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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.

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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

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Period end amount of total net PPE.

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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

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

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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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