Dispositions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Public Utilities, Property, Plant and Equipment, Net	$ 12,410.0	$ 12,232.0
Nonutility Property and Investments, Net	477.0scg_NonutilityPropertyAndInvestmentsNet	472.0scg_NonutilityPropertyAndInvestmentsNet
Assets, Current	1,435.0us-gaap_AssetsCurrent	2,145.0us-gaap_AssetsCurrent
Regulated Entity, Other Assets, Noncurrent	2,084.0	2,003.0
Assets held for sale	0	341.0
Liabilities, Current	1,732.0us-gaap_LiabilitiesCurrent	2,533.0us-gaap_LiabilitiesCurrent
Liabilities, Noncurrent	3,824.0us-gaap_LiabilitiesNoncurrent	3,801.0us-gaap_LiabilitiesNoncurrent
Liabilities held for sale		52.0scg_Disposalgroupliabilitiesheldforsale
Estimated pre-tax gain on sale of CGT and SCI	342scg_PretaxgainonsaleofCGTandSCI
Assets Held-for-sale [Member] \| CGT [Member]
Public Utilities, Property, Plant and Equipment, Net		288.4
Nonutility Property and Investments, Net		0.6
Assets, Current		6.5
Regulated Entity, Other Assets, Noncurrent		0.9
Assets held for sale		296.4
Assets Held-for-sale [Member] \| SCANA Communications [Member]
Public Utilities, Property, Plant and Equipment, Net		0
Nonutility Property and Investments, Net		40.1
Assets, Current		3.9
Regulated Entity, Other Assets, Noncurrent		0.2
Assets held for sale		44.2
Assets Held-for-sale [Member] \| Held for Sale, CGT and SCI [Member]
Public Utilities, Property, Plant and Equipment, Net		288.4
Nonutility Property and Investments, Net		40.7
Assets, Current		10.4
Regulated Entity, Other Assets, Noncurrent		1.1
Assets held for sale		340.6
Liabilities, Held for Sale [Member] \| CGT [Member]
Liabilities, Current		3.5
Liabilities, Noncurrent		42.9
Liabilities held for sale		46.4
Liabilities, Held for Sale [Member] \| SCANA Communications [Member]
Liabilities, Current		2.2
Liabilities, Noncurrent		3.1
Liabilities held for sale		5.3
Liabilities, Held for Sale [Member] \| Held for Sale, CGT and SCI [Member]
Liabilities, Current		5.7
Liabilities, Noncurrent		46.0
Liabilities held for sale		$ 51.7

Disposal group current assets held for sale

No definition available.

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- Definition

Disposal group liabilities held for sale

+ References

No definition available.

+ Details

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- Definition

Amount representing the nonutility properties and investments as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Pre-tax gain on sale of CGT and SCI

+ References

No definition available.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.9)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6801-107765

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 9

-Article 5

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- Definition

Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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- Definition

Amount of obligation due after one year or beyond the normal operating cycle, if longer.

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- Definition

Period end amount of total net PPE.

+ References

No definition available.

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- Definition

Total of noncurrent other assets held by public utility entities.

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