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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Schedule of Property Plant and Equipment

The service life ranges and weighted average remaining service life of PPE as at December 31 were as follows.

						2023									2022
(years)						Service Life Ranges			Weighted Average Remaining Service Life						Service Life Ranges			Weighted Average Remaining Service Life
Distribution
Electric						5-80			31						5-80			31
Gas						18-95			38						18-95			39
Transmission
Electric						20-90			41						20-90			41
Gas						10-85			36						10-85			35
Generation						2-95			23						5-95			22
Other						3-80			10						3-80			11

($ millions)						Cost						Accumulated Depreciation						Net Book Value
2023
Distribution
Electric						14,352						(3,708)						10,644
Gas						6,682						(1,736)						4,946
Transmission
Electric						19,886						(4,267)						15,619
Gas						2,751						(843)						1,908
Generation						7,192						(2,739)						4,453
Other						4,444						(1,645)						2,799
Assets under construction						2,581						—						2,581
Land						435						—						435
						58,323						(14,938)						43,385

2022
Distribution
Electric						13,650						(3,715)						9,935
Gas						6,396						(1,626)						4,770
Transmission
Electric						19,056						(4,074)						14,982
Gas						2,600						(800)						1,800
Generation						7,173						(2,679)						4,494
Other						4,803						(1,610)						3,193
Assets under construction						2,094						—						2,094
Land						395						—						395
						56,167						(14,504)						41,663

Schedule of Intangible Assets

The service life ranges and weighted average remaining service life of finite-life intangible assets as at December 31 were as follows.

						2023									2022
(years)						Service Life Ranges			Weighted Average Remaining Service Life						Service Life Ranges			Weighted Average Remaining Service Life
Computer software						3-18			5						3-15			5
Land, transmission and water rights						30-90			52						34-90			53
Other						10-100			14						10-100			14

									Accumulated						Net Book
($ millions)			Cost						Amortization						Value
2023
Computer software			1,040						(528)						512
Land, transmission and water rights			1,071						(182)						889
Other			132						(81)						51
Assets under construction			58						—						58
			2,301						(791)						1,510

2022
Computer software			985						(497)						488
Land, transmission and water rights			1,064						(171)						893
Other			135						(78)						57
Assets under construction			110						—						110
			2,294						(746)						1,548

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Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482665/350-30-50-1

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-Topic 350
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-Paragraph 2
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Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation expense and method used, including composite depreciation, and accumulated depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 980
-SubTopic 20
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481834/980-20-45-1

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