CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Common Stock, Shares, Outstanding	143	143
Public Utilities, Property, Plant and Equipment, Net	$ 12,410.0	$ 12,232.0
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	120	122
Allowance for Doubtful Accounts Receivable, Current	7	7
Write-down, Goodwill	230	230
Assets, Current	1,435.0	2,145.0
Regulated Entity, Other Assets, Noncurrent	2,084.0	2,003.0
SCEG
Common Stock, Shares, Outstanding	40	40
Public Utilities, Property, Plant and Equipment, Net	10,955.0	10,783.0
Allowance for Doubtful Accounts Receivable, Current	3	4
Assets, Current	1,018.0	1,246.0
Regulated Entity, Other Assets, Noncurrent	1,977.0	1,896.0
SCEG | Variable Interest Entity, Primary Beneficiary [Member]
Public Utilities, Property, Plant and Equipment, Net	716.0	675.0
Assets, Current	0	158.0
Regulated Entity, Other Assets, Noncurrent	$ 0	$ 50.0