v3.10.0.1

LONG-TERM AND SHORT-TERM DEBT (NARRATIVE) (Details)	12 Months Ended
	Dec. 31, 2018
Debt Instrument [Line Items]
months preceding issuance of bonds	18
Unfunded property additions	70.00%
Consecutive months for bond ratio	12

X

- Definition

Consecutive months for bond ratio

+ References

No definition available.

+ Details

Name:	scg_ConsecutiveMonthsForBondRatio
Namespace Prefix:	scg_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

months preceding issuance of bonds

+ References

No definition available.

+ Details

Name:	scg_MonthsPrecedingIssuanceOfBonds
Namespace Prefix:	scg_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Unfunded property additions

+ References

No definition available.

+ Details

Name:	scg_UnfundedPropertyAdditions
Namespace Prefix:	scg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration