DERIVATIVE FINANCIAL INSTRUMENTS (Tables)

9 Months Ended

Sep. 30, 2017

Derivative [Line Items]

Schedule of Nonmonetary Notional Amounts of Outstanding Derivative Positions [Table Text Block]

The Company was party to natural gas derivative contracts outstanding in the following quantities:

	Commodity and Other Energy Management Contracts (in MMBTU)
Hedge designation	Gas Distribution	Gas Marketing	Total
As of September 30, 2017
Commodity contracts	8,330,000	16,723,000	25,053,000
Energy management contracts (a)	—	46,346,530	46,346,530
Total (a)	8,330,000	63,069,530	71,399,530
As of December 31, 2016
Commodity contracts	4,510,000	11,947,000	16,457,000
Energy management contracts (a)	—	67,447,223	67,447,223
Total (a)	4,510,000	79,394,223	83,904,223

(a)  Includes amounts related to basis swap contracts totaling 4,954,667 MMBTU in 2017 and 730,721 MMBTU in 2016.

Schedule of Derivative Instruments [Table Text Block]

The aggregate notional amounts of the interest rate swaps were as follows:

Interest Rate Swaps
	The Company				Consolidated SCE&G
Millions of dollars	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
Designated as hedging instruments	$	111.2	$	115.6	$	36.4	$	36.4
Not designated as hedging instruments	1,285.0		1,285.0		1,285.0		1,285.0

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

The following table shows the fair value and balance sheet location of derivative instruments. Although derivatives subject to master netting arrangements are netted on the balance sheet, the fair values presented below are shown gross and cash collateral on the derivatives has not been netted against the fair values shown.

Fair Values of Derivative Instruments
		The Company				Consolidated SCE&G
Millions of dollars	Balance Sheet Location	Asset		Liability		Asset		Liability
As of September 30, 2017
Designated as hedging instruments
Interest rate contracts
	Derivative financial instruments	—		$	3	—		$	1
	Other deferred credits and other liabilities	—		25		—		9
Commodity contracts
	Prepayments	—		1		—		—
	Derivative financial instruments	$	1	1		—		—
Total		$	1	$	30	—		$	10
Not designated as hedging instruments
Interest rate contracts
	Other deferred debits and other assets	$	56	—		$	56	—
	Derivative financial instruments	—		$	40	—		$	40
	Other deferred credits and other liabilities	—		4		—		4
Commodity contracts
	Prepayments	1		—		—		—
Energy management contracts
	Prepayments	2		1		—		—
	Other current assets	2		—		—		—
	Other deferred debits and other assets	1		—		—		—
	Derivative financial instruments	—		2		—		—
	Other deferred credits and other liabilities	—		1		—		—
Total		$	62	$	48	$	56	$	44
As of December 31, 2016
Designated as hedging instruments
Interest rate contracts
	Derivative financial instruments	—		$	4	—		$	1
	Other deferred credits and other liabilities	—		24		—		8
Commodity contracts
	Prepayments	$	5	—		—		—
	Other current assets	1		—		—		—
Total		$	6	$	28	—		$	9
Not designated as hedging instruments
Interest rate contracts
	Other deferred debits and other assets	$	71	—		$	71	—
	Derivative financial instruments	—		$	27	—		$	27
	Other deferred credits and other liabilities	—		3		—		3
Commodity contracts
	Other current assets	3		—		—		—
Energy management contracts
	Prepayments	6		2		—		—
	Other current assets	2		1		—		—
	Other deferred debits and other assets	2		—		—		—
	Derivative financial instruments	—		4		—		—
	Other deferred credits and other liabilities	—		2		—		—
Total		$	84	$	39	$	71	$	30

Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

Derivatives in Cash Flow Hedging Relationships

The Company and Consolidated SCE&G:
	Loss Deferred in Regulatory Accounts							Loss Reclassified from Deferred Accounts into Income
Millions of dollars	2017			2016			Location	2017			2016
Three Months Ended September 30,
Interest rate contracts	—			$	(1	)	Interest expense	—			$	(1	)
Nine Months Ended September 30,
Interest rate contracts	$	(1	)	$	(6	)	Interest expense	$	(1	)	$	(2	)

The Company:
	Gain (Loss) Recognized in OCI, net of tax							Gain (Loss) Reclassified from AOCI into Income, net of tax
Millions of dollars	2017			2016			Location	2017			2016
Three Months Ended September 30,
Interest rate contracts	—			$	1		Interest expense	$	(2	)	$	(2	)
Commodity contracts	—			(2		)	Gas purchased for resale	—			—
Total	—			$	(1	)		$	(2	)	$	(2	)
Nine Months Ended September 30,
Interest rate contracts	$	(1	)	$	(4	)	Interest expense	$	(6	)	$	(6	)
Commodity contracts	(4		)	—			Gas purchased for resale	2			(6		)
Total	$	(5	)	$	(4	)		$	(4	)	$	(12	)

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

Derivatives Not designated as Hedging Instruments
The Company and Consolidated SCE&G:
Millions of dollars	Loss Deferred in Regulatory Accounts			Location	Loss Reclassified from Deferred Accounts into Income
Three Months Ended September 30, 2017
Interest rate contracts	$	(6	)	Interest Expense	$	(1	)
Nine Months Ended September 30, 2017
Interest rate contracts	$	(30	)	Interest Expense	$	(2	)
Three Months Ended September 30, 2016
Interest rate contracts	$	(24	)	Other Income	$	(1	)
Nine Months Ended September 30, 2016
Interest rate contracts	$	(268	)	Other Income	$	(1	)

Disclosure of Credit Derivatives [Table Text Block]

Derivative Contracts with Credit Contingent Features
	The Company				Consolidated SCE&G
Millions of dollars	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
in Net Liability Position
Aggregate fair value of derivatives in net liability position	$	67.1	$	50.3	$	47.7	$	30.3
Fair value of collateral already posted	31.0		29.2		10.3		9.2
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	$	36.1	$	21.1	$	37.4	$	21.1
in Net Asset Position
Aggregate fair value of derivatives in net asset position	$	49.0	$	62.9	$	49.0	$	62.0
Fair value of collateral already posted	—		—		—		—
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	$	49.0	$	62.9	$	49.0	$	62.0

Offseting Assets [Table Text Block]

Information related to the offsetting of derivative assets and derivative liabilities follows:

Derivative Assets	The Company												Consolidated SCE&G
Millions of dollars	Interest Rate Contracts			Commodity Contracts			Energy Management Contracts			Total			Interest Rate Contracts
As of September 30, 2017
Gross Amounts of Recognized Assets	$	56		$	2		$	5		$	63		$	56
Gross Amounts Offset in Statement of Financial Position	—			(1		)	(2		)	(3		)	—
Net Amounts Presented in Statement of Financial Position	56			1			3			60			56
Gross Amounts Not Offset - Financial Instruments	(7		)	—			—			(7		)	(7		)
Gross Amounts Not Offset - Cash Collateral Received	—			—			—			—			—
Net Amount	$	49		$	1		$	3		$	53		$	49
Balance sheet location
Prepayments										$	1		—
Other current assets										2			—
Other deferred debits and other assets										57			$	56
Total										$	60		$	56
As of December 31, 2016
Gross Amounts of Recognized Assets	$	71		$	9		$	10		$	90		$	71
Gross Amounts Offset in Statement of Financial Position	—			—			(4		)	(4		)	—
Net Amounts Presented in Statement of Financial Position	71			9			6			86			71
Gross Amounts Not Offset - Financial Instruments	(9		)	—			—			(9		)	(9		)
Gross Amounts Not Offset - Cash Collateral Received	—			—			—			—			—
Net Amount	$	62		$	9		$	6		$	77		$	62
Balance sheet location
Prepayments										$	9		—
Other current assets										5			—
Other deferred debits and other assets										72			$	71
Total										$	86		$	71

Offsetting Liabilities [Table Text Block]

Derivative Liabilities	The Company												Consolidated SCE&G
Millions of dollars	Interest Rate Contracts			Commodity Contracts			Energy Management Contracts			Total			Interest Rate Contracts
As of September 30, 2017
Gross Amounts of Recognized Liabilities	$	72		$	2		$	4		$	78		$	54
Gross Amounts Offset in Statement of Financial Position	—			(1		)	(2		)	(3		)	—
Net Amounts Presented in Statement of Financial Position	72			1			2			75			54
Gross Amounts Not Offset - Financial Instruments	(7		)	—			—			(7		)	(7		)
Gross Amounts Not Offset - Cash Collateral Posted	(30		)	—			(1		)	(31		)	(10		)
Net Amount	$	35		$	1		$	1		$	37		$	37
Balance sheet location
Prepayments										$	1		—
Derivative financial instruments										45			$	41
Other deferred credits and other liabilities										29			13
Total										$	75		$	54
As of December 31, 2016
Gross Amounts of Recognized Liabilities	$	58		—			$	9		$	67		$	39
Gross Amounts Offset in Statement of Financial Position	—			—			(3		)	(3		)	—
Net Amounts Presented in Statement of Financial Position	58			—			6			64			39
Gross Amounts Not Offset - Financial Instruments	(9		)	—			—			(9		)	(9		)
Gross Amounts Not Offset - Cash Collateral Posted	(29		)	—			—			(29		)	(9		)
Net Amount	$	20		—			$	6		$	26		$	21
Balance sheet location
Derivative financial instruments										$	35		$	28
Other deferred credits and other liabilities										29			11
Total										$	64		$	39

SCEG

Derivative [Line Items]

Schedule of Derivative Instruments [Table Text Block]

The aggregate notional amounts of the interest rate swaps were as follows:

Interest Rate Swaps
	The Company				Consolidated SCE&G
Millions of dollars	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
Designated as hedging instruments	$	111.2	$	115.6	$	36.4	$	36.4
Not designated as hedging instruments	1,285.0		1,285.0		1,285.0		1,285.0

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

The following table shows the fair value and balance sheet location of derivative instruments. Although derivatives subject to master netting arrangements are netted on the balance sheet, the fair values presented below are shown gross and cash collateral on the derivatives has not been netted against the fair values shown.

Fair Values of Derivative Instruments
		The Company				Consolidated SCE&G
Millions of dollars	Balance Sheet Location	Asset		Liability		Asset		Liability
As of September 30, 2017
Designated as hedging instruments
Interest rate contracts
	Derivative financial instruments	—		$	3	—		$	1
	Other deferred credits and other liabilities	—		25		—		9
Commodity contracts
	Prepayments	—		1		—		—
	Derivative financial instruments	$	1	1		—		—
Total		$	1	$	30	—		$	10
Not designated as hedging instruments
Interest rate contracts
	Other deferred debits and other assets	$	56	—		$	56	—
	Derivative financial instruments	—		$	40	—		$	40
	Other deferred credits and other liabilities	—		4		—		4
Commodity contracts
	Prepayments	1		—		—		—
Energy management contracts
	Prepayments	2		1		—		—
	Other current assets	2		—		—		—
	Other deferred debits and other assets	1		—		—		—
	Derivative financial instruments	—		2		—		—
	Other deferred credits and other liabilities	—		1		—		—
Total		$	62	$	48	$	56	$	44
As of December 31, 2016
Designated as hedging instruments
Interest rate contracts
	Derivative financial instruments	—		$	4	—		$	1
	Other deferred credits and other liabilities	—		24		—		8
Commodity contracts
	Prepayments	$	5	—		—		—
	Other current assets	1		—		—		—
Total		$	6	$	28	—		$	9
Not designated as hedging instruments
Interest rate contracts
	Other deferred debits and other assets	$	71	—		$	71	—
	Derivative financial instruments	—		$	27	—		$	27
	Other deferred credits and other liabilities	—		3		—		3
Commodity contracts
	Other current assets	3		—		—		—
Energy management contracts
	Prepayments	6		2		—		—
	Other current assets	2		1		—		—
	Other deferred debits and other assets	2		—		—		—
	Derivative financial instruments	—		4		—		—
	Other deferred credits and other liabilities	—		2		—		—
Total		$	84	$	39	$	71	$	30

Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

Derivatives in Cash Flow Hedging Relationships

The Company and Consolidated SCE&G:
	Loss Deferred in Regulatory Accounts							Loss Reclassified from Deferred Accounts into Income
Millions of dollars	2017			2016			Location	2017			2016
Three Months Ended September 30,
Interest rate contracts	—			$	(1	)	Interest expense	—			$	(1	)
Nine Months Ended September 30,
Interest rate contracts	$	(1	)	$	(6	)	Interest expense	$	(1	)	$	(2	)

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

Derivatives Not designated as Hedging Instruments
The Company and Consolidated SCE&G:
Millions of dollars	Loss Deferred in Regulatory Accounts			Location	Loss Reclassified from Deferred Accounts into Income
Three Months Ended September 30, 2017
Interest rate contracts	$	(6	)	Interest Expense	$	(1	)
Nine Months Ended September 30, 2017
Interest rate contracts	$	(30	)	Interest Expense	$	(2	)
Three Months Ended September 30, 2016
Interest rate contracts	$	(24	)	Other Income	$	(1	)
Nine Months Ended September 30, 2016
Interest rate contracts	$	(268	)	Other Income	$	(1	)

Disclosure of Credit Derivatives [Table Text Block]

Derivative Contracts with Credit Contingent Features
	The Company				Consolidated SCE&G
Millions of dollars	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
in Net Liability Position
Aggregate fair value of derivatives in net liability position	$	67.1	$	50.3	$	47.7	$	30.3
Fair value of collateral already posted	31.0		29.2		10.3		9.2
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	$	36.1	$	21.1	$	37.4	$	21.1
in Net Asset Position
Aggregate fair value of derivatives in net asset position	$	49.0	$	62.9	$	49.0	$	62.0
Fair value of collateral already posted	—		—		—		—
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	$	49.0	$	62.9	$	49.0	$	62.0

Offseting Assets [Table Text Block]

Information related to the offsetting of derivative assets and derivative liabilities follows:

Derivative Assets	The Company												Consolidated SCE&G
Millions of dollars	Interest Rate Contracts			Commodity Contracts			Energy Management Contracts			Total			Interest Rate Contracts
As of September 30, 2017
Gross Amounts of Recognized Assets	$	56		$	2		$	5		$	63		$	56
Gross Amounts Offset in Statement of Financial Position	—			(1		)	(2		)	(3		)	—
Net Amounts Presented in Statement of Financial Position	56			1			3			60			56
Gross Amounts Not Offset - Financial Instruments	(7		)	—			—			(7		)	(7		)
Gross Amounts Not Offset - Cash Collateral Received	—			—			—			—			—
Net Amount	$	49		$	1		$	3		$	53		$	49
Balance sheet location
Prepayments										$	1		—
Other current assets										2			—
Other deferred debits and other assets										57			$	56
Total										$	60		$	56
As of December 31, 2016
Gross Amounts of Recognized Assets	$	71		$	9		$	10		$	90		$	71
Gross Amounts Offset in Statement of Financial Position	—			—			(4		)	(4		)	—
Net Amounts Presented in Statement of Financial Position	71			9			6			86			71
Gross Amounts Not Offset - Financial Instruments	(9		)	—			—			(9		)	(9		)
Gross Amounts Not Offset - Cash Collateral Received	—			—			—			—			—
Net Amount	$	62		$	9		$	6		$	77		$	62
Balance sheet location
Prepayments										$	9		—
Other current assets										5			—
Other deferred debits and other assets										72			$	71
Total										$	86		$	71

Offsetting Liabilities [Table Text Block]

Derivative Liabilities	The Company												Consolidated SCE&G
Millions of dollars	Interest Rate Contracts			Commodity Contracts			Energy Management Contracts			Total			Interest Rate Contracts
As of September 30, 2017
Gross Amounts of Recognized Liabilities	$	72		$	2		$	4		$	78		$	54
Gross Amounts Offset in Statement of Financial Position	—			(1		)	(2		)	(3		)	—
Net Amounts Presented in Statement of Financial Position	72			1			2			75			54
Gross Amounts Not Offset - Financial Instruments	(7		)	—			—			(7		)	(7		)
Gross Amounts Not Offset - Cash Collateral Posted	(30		)	—			(1		)	(31		)	(10		)
Net Amount	$	35		$	1		$	1		$	37		$	37
Balance sheet location
Prepayments										$	1		—
Derivative financial instruments										45			$	41
Other deferred credits and other liabilities										29			13
Total										$	75		$	54
As of December 31, 2016
Gross Amounts of Recognized Liabilities	$	58		—			$	9		$	67		$	39
Gross Amounts Offset in Statement of Financial Position	—			—			(3		)	(3		)	—
Net Amounts Presented in Statement of Financial Position	58			—			6			64			39
Gross Amounts Not Offset - Financial Instruments	(9		)	—			—			(9		)	(9		)
Gross Amounts Not Offset - Cash Collateral Posted	(29		)	—			—			(29		)	(9		)
Net Amount	$	20		—			$	6		$	26		$	21
Balance sheet location
Derivative financial instruments										$	35		$	28
Other deferred credits and other liabilities										29			11
Total										$	64		$	39