LONG-TERM AND SHORT-TERM DEBT (Tables)

3 Months Ended

Mar. 31, 2018

Short-term Debt [Line Items]

Schedule of Line of Credit Facilities [Table Text Block]

March 31, 2018 (Millions of dollars)	Total		SCANA			Consolidated SCE&G			PSNC  Energy
Lines of credit:	+
Five-year, expiring December 2020	$	1,300.0	$	400.0		$	700.0		$	200.0
Fuel Company five-year, expiring December 2020	500.0		—			500.0			—
Three-year, expiring December 2018	200.0		—			200.0			—
Total committed long-term	2,000.0		400.0			1,400.0			200.0
LOC advances	100.0		—			100.0			—
Weighted average interest rate			—			2.97		%	—
Outstanding commercial paper (270 or fewer days)	248.0		10.9			145.8			91.3
Weighted average interest rate			2.70		%	2.75		%	2.52		%
Letters of credit supported by LOC	46.7		46.4			0.3			—
Available	$	1,605.3	$	342.7		$	1,153.9		$	108.7

December 31, 2017 (Millions of dollars)	Total		SCANA		Consolidated SCE&G			PSNC  Energy
Lines of credit:
Five-year, expiring December 2020	$	1,300.0	$	400.0	$	700.0		$	200.0
Fuel Company five-year, expiring December 2020	500.0		—		500.0			—
Three-year, expiring December 2018	200.0		—		200.0			—
Total committed long-term	2,000.0		400.0		1,400.0			200.0
Outstanding commercial paper (270 or fewer days)	350.3		—		251.6			98.7
Weighted average interest rate			—		1.92		%	1.93		%
Letters of credit supported by LOC	3.3		3.0		0.3			—
Available	$	1,646.4	$	397.0	$	1,148.1		$	101.3

SCEG

Short-term Debt [Line Items]

Schedule of Line of Credit Facilities [Table Text Block]

March 31, 2018 (Millions of dollars)	Total		SCANA			Consolidated SCE&G			PSNC  Energy
Lines of credit:	+
Five-year, expiring December 2020	$	1,300.0	$	400.0		$	700.0		$	200.0
Fuel Company five-year, expiring December 2020	500.0		—			500.0			—
Three-year, expiring December 2018	200.0		—			200.0			—
Total committed long-term	2,000.0		400.0			1,400.0			200.0
LOC advances	100.0		—			100.0			—
Weighted average interest rate			—			2.97		%	—
Outstanding commercial paper (270 or fewer days)	248.0		10.9			145.8			91.3
Weighted average interest rate			2.70		%	2.75		%	2.52		%
Letters of credit supported by LOC	46.7		46.4			0.3			—
Available	$	1,605.3	$	342.7		$	1,153.9		$	108.7

December 31, 2017 (Millions of dollars)	Total		SCANA		Consolidated SCE&G			PSNC  Energy
Lines of credit:
Five-year, expiring December 2020	$	1,300.0	$	400.0	$	700.0		$	200.0
Fuel Company five-year, expiring December 2020	500.0		—		500.0			—
Three-year, expiring December 2018	200.0		—		200.0			—
Total committed long-term	2,000.0		400.0		1,400.0			200.0
Outstanding commercial paper (270 or fewer days)	350.3		—		251.6			98.7
Weighted average interest rate			—		1.92		%	1.93		%
Letters of credit supported by LOC	3.3		3.0		0.3			—
Available	$	1,646.4	$	397.0	$	1,148.1		$	101.3