CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Common Stock, Shares, Outstanding	142.9	142.9
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 137	$ 138
Public Utilities, Property, Plant and Equipment, Net	14,535	14,324
Allowance for Doubtful Accounts Receivable, Current	6	6
Write-down, Goodwill	230	230
Assets, Current	1,047	1,506
Regulated Entity, Other Assets, Noncurrent	$ 2,398	$ 2,402
SCEG
Common Stock, Shares, Outstanding	40.3	40.3
Public Utilities, Property, Plant and Equipment, Net	$ 12,771	$ 12,603
Allowance for Doubtful Accounts Receivable, Current	3	3
Assets, Current	730	1,020
Regulated Entity, Other Assets, Noncurrent	2,266	2,273
SCEG | Variable Interest Entity, Primary Beneficiary [Member]
Public Utilities, Property, Plant and Equipment, Net	752	756
Assets, Current	74	85
Regulated Entity, Other Assets, Noncurrent	$ 48	$ 52