CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Common Stock, Shares, Outstanding	142.9	142.9
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 141	$ 138
Public Utilities, Property, Plant and Equipment, Net	14,962	14,324
Allowance for Doubtful Accounts Receivable, Current	6	6
Write-down, Goodwill	230	230
Assets, Current	1,186	1,506
Regulated Entity, Other Assets, Noncurrent	$ 2,426	$ 2,402
SCEG
Common Stock, Shares, Outstanding	40.3	40.3
Public Utilities, Property, Plant and Equipment, Net	$ 13,112	$ 12,603
Allowance for Doubtful Accounts Receivable, Current	4	3
Assets, Current	875	1,020
Regulated Entity, Other Assets, Noncurrent	2,294	2,273
SCEG | Variable Interest Entity, Primary Beneficiary [Member]
Public Utilities, Property, Plant and Equipment, Net	746	756
Assets, Current	79	85
Regulated Entity, Other Assets, Noncurrent	$ 50	$ 52