Dispositions (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2015	Dec. 31, 2014
Public Utilities, Property, Plant and Equipment, Net	$ 12,591.0	$ 12,232.0
Nonutility Property and Investments, Net	474.0	472.0
Assets, Current	1,289.0	2,145.0
Regulated Entity, Other Assets, Noncurrent	2,014.0	2,003.0
Assets held for sale	0.0	341.0
Liabilities, Current	1,164.0	2,533.0
Liabilities, Noncurrent	3,835.0	3,801.0
Liabilities held for sale		52.0
Estimated pre-tax gain on sale of CGT and SCI	$ 342.0
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		0.0
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

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Disposal group liabilities held for sale

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

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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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Total of noncurrent other assets held by public utility entities.

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