CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - SCEG - USD ($) shares in Millions, $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Common Stock, Shares, Outstanding	40.3	40.3
Public Utilities, Property, Plant and Equipment, Net	$ 8,655	$ 8,783
Allowance for Doubtful Accounts Receivable, Current	3	4
Assets, Current	1,018	1,688
Regulated Entity, Other Assets, Noncurrent	4,180	4,229
Variable Interest Entity, Primary Beneficiary [Member]
Public Utilities, Property, Plant and Equipment, Net	697	711
Assets, Current	89	96
Regulated Entity, Other Assets, Noncurrent	$ 37	$ 34