DERIVATIVE FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2018

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 June 30, 2018
Commodity contracts	6,090,000	14,412,000	20,502,000
Energy management contracts (a)	—	41,876,028	41,876,028
Total (a)	6,090,000	56,288,028	62,378,028
As of December 31, 2017
Commodity contracts	6,430,000	13,433,000	19,863,000
Energy management contracts (a)	—	41,856,890	41,856,890
Total (a)	6,430,000	55,289,890	61,719,890

(a)  Includes amounts related to basis swap contracts totaling 11,864,000 MMBTU in 2018 and 2,582,000 MMBTU in 2017.

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	June 30, 2018		December 31, 2017		June 30, 2018		December 31, 2017
Designated as hedging instruments	$	106.8	$	111.2	$	36.4	$	36.4
Not designated as hedging instruments	35.0		735.0		35.0		735.0

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 consolidated 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 June 30, 2018
Designated as hedging instruments
Interest rate contracts	Derivative financial instruments	—		$	3	—		$	1
	Other deferred credits and other liabilities	—		17		—		6
Commodity contracts	Prepayments	$	1	—		—		—
Total		$	1	$	20	—		$	7
Not designated as hedging instruments
Interest rate contracts	Other deferred credits and other liabilities	—		$	3	—		$	3
Commodity contracts	Prepayments	$	1	—		—		—
Energy management contracts	Other current assets	1		—		—		—
	Other deferred debits and other assets	1		—		—		—
	Other current liabilities	—		1		—		—
	Derivative financial instruments	—		1		—		—
Total		$	3	$	5	—		$	3
As of December 31, 2017
Designated as hedging instruments
Interest rate contracts	Derivative financial instruments	—		$	3	—		$	1
	Other deferred credits and other liabilities	—		24		—		9
Commodity contracts	Prepayments	—		2		—		—
	Other current assets	—		1		—		—
Total		—		$	30	—		$	10
Not designated as hedging instruments
Interest rate contracts	Derivative financial instruments	$	54	$	1	$	54	$	1
	Other deferred credits and other liabilities	—		4		—		4
Commodity contracts	Other current assets	1		—		—		—
Energy management contracts	Prepayments	—		1		—		—
	Other current assets	3		—		—		—
	Other deferred debits and other assets	1		—		—		—
	Derivative financial instruments	—		2		—		—
Total		$	59	$	8	$	54	$	5

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

The Company and Consolidated SCE&G:
	Gain (Loss) Deferred in Regulatory Accounts						Gain (Loss) Reclassified from Deferred Accounts into Income
Millions of dollars	2018		2017			Location	2018			2017
Three Months Ended June 30,
Interest rate contracts	—		$	(1	)	Interest expense	$	(1	)	—
Six Months Ended June 30,
Interest rate contracts	$	2	$	(1	)	Interest expense	$	(1	)	$	(1	)

The Company:
	Gain (Loss) Recognized in OCI, net of tax						Gain (Loss) Reclassified from AOCI into Income, net of tax
Millions of dollars	2018		2017			Location	2018			2017
Three Months Ended June 30,
Interest rate contracts	—		$	(1	)	Interest expense	$	(2	)	$	(2	)
Commodity contracts	$	1	(2		)	Gas purchased for resale	—			—
Total	$	1	$	(3	)		$	(2	)	$	(2	)
Six Months Ended June 30,
Interest rate contracts	$	2	$	(1	)	Interest expense	$	(4	)	$	(4	)
Commodity contracts	2		(4		)	Gas purchased for resale	(2		)	2
Total	$	4	$	(5	)		$	(6	)	$	(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:
	Gain (Loss) Deferred in Regulatory Accounts						Gain (Loss) Reclassified from Deferred Accounts into Income
Millions of dollars	2018		2017			Location	2018			2017
Three Months Ended June 30,
Interest rate contracts	—		$	(35	)	Interest Expense	$	(1	)	—
						Other Income	—			—
Six Months Ended June 30,
Interest rate contracts	$	65	$	(24	)	Interest Expense	$	(1	)	$	(1	)
						Other Income	115			—

Disclosure of Credit Derivatives [Table Text Block]

Derivative Contracts with Credit Contingent Features
	The Company					Consolidated SCE&G
Millions of dollars	June 30, 2018			December 31, 2017		June 30, 2018			December 31, 2017
in Net Liability Position
Aggregate fair value of derivatives in net liability position	$	24.1		$	33.7	$	10.3		$	14.7
Fair value of collateral already posted	25.3			28.9		10.9			10.1
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	$	(1.2	)	$	4.8	$	(0.6	)	$	4.6
in Net Asset Position
Aggregate fair value of derivatives in net asset position	—			$	53.5	—			$	53.5
Fair value of collateral already posted	—			—		—			—
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	—			$	53.5	—			$	53.5

Offseting Assets [Table Text Block]

Information related to the offsetting of derivative assets 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 June 30, 2018
Gross Amounts of Recognized Assets	—		$	2	$	2	$	4	—
Gross Amounts Offset in Statement of Financial Position	—		—		—		—		—
Net Amounts Presented in Statement of Financial Position	—		2		2		4		—
Gross Amounts Not Offset - Financial Instruments	—		—		—		—		—
Gross Amounts Not Offset - Cash Collateral Received	—		—		—		—		—
Net Amount	—		$	2	$	2	$	4	—
Balance sheet location
Prepayments							$	2	—
Other current assets							1		—
Other deferred debits and other assets							1		—
Total							$	4	—
As of December 31, 2017
Gross Amounts of Recognized Assets	$	54	$	1	$	4	$	59	$	54
Gross Amounts Offset in Statement of Financial Position	—		—		—		—		—
Net Amounts Presented in Statement of Financial Position	54		1		4		59		54
Gross Amounts Not Offset - Financial Instruments	—		—		—		—		—
Gross Amounts Not Offset - Cash Collateral Received	—		—		—		—		—
Net Amount	$	54	$	1	$	4	$	59	$	54
Balance sheet location
Other current assets							$	58	$	54
Other deferred debits and other assets							1		—
Total							$	59	$	54

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 June 30, 2018
Gross Amounts of Recognized Liabilities	$	23		—		$	2		$	25		$	10
Gross Amounts Offset in Statement of Financial Position	—			—		—			—			—
Net Amounts Presented in Statement of Financial Position	23			—		2			25			10
Gross Amounts Not Offset - Financial Instruments	—			—		—			—			—
Gross Amounts Not Offset - Cash Collateral Posted	(24		)	—		(1		)	(25		)	(11		)
Net Amount	$	(1	)	—		$	1		—			$	(1	)
Balance sheet location
Derivative financial instruments									$	4		$	1
Other current liabilities									1			—
Other deferred credits and other liabilities									20			9
Total									$	25		$	10
As of December 31, 2017
Gross Amounts of Recognized Liabilities	$	32		$	3	$	3		$	38		$	15
Gross Amounts Offset in Statement of Financial Position	—			—		(1		)	(1		)	—
Net Amounts Presented in Statement of Financial Position	32			3		2			37			15
Gross Amounts Not Offset - Financial Instruments	—			—		—			—			—
Gross Amounts Not Offset - Cash Collateral Posted	28			—		(1		)	27			—
Net Amount	$	60		$	3	$	1		$	64		$	15
Balance sheet location
Other current assets									$	2		—
Derivative financial instruments									7			$	2
Other deferred credits and other liabilities									28			13
Total									$	37		$	15

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	June 30, 2018		December 31, 2017		June 30, 2018		December 31, 2017
Designated as hedging instruments	$	106.8	$	111.2	$	36.4	$	36.4
Not designated as hedging instruments	35.0		735.0		35.0		735.0

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 consolidated 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 June 30, 2018
Designated as hedging instruments
Interest rate contracts	Derivative financial instruments	—		$	3	—		$	1
	Other deferred credits and other liabilities	—		17		—		6
Commodity contracts	Prepayments	$	1	—		—		—
Total		$	1	$	20	—		$	7
Not designated as hedging instruments
Interest rate contracts	Other deferred credits and other liabilities	—		$	3	—		$	3
Commodity contracts	Prepayments	$	1	—		—		—
Energy management contracts	Other current assets	1		—		—		—
	Other deferred debits and other assets	1		—		—		—
	Other current liabilities	—		1		—		—
	Derivative financial instruments	—		1		—		—
Total		$	3	$	5	—		$	3
As of December 31, 2017
Designated as hedging instruments
Interest rate contracts	Derivative financial instruments	—		$	3	—		$	1
	Other deferred credits and other liabilities	—		24		—		9
Commodity contracts	Prepayments	—		2		—		—
	Other current assets	—		1		—		—
Total		—		$	30	—		$	10
Not designated as hedging instruments
Interest rate contracts	Derivative financial instruments	$	54	$	1	$	54	$	1
	Other deferred credits and other liabilities	—		4		—		4
Commodity contracts	Other current assets	1		—		—		—
Energy management contracts	Prepayments	—		1		—		—
	Other current assets	3		—		—		—
	Other deferred debits and other assets	1		—		—		—
	Derivative financial instruments	—		2		—		—
Total		$	59	$	8	$	54	$	5

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

The Company and Consolidated SCE&G:
	Gain (Loss) Deferred in Regulatory Accounts						Gain (Loss) Reclassified from Deferred Accounts into Income
Millions of dollars	2018		2017			Location	2018			2017
Three Months Ended June 30,
Interest rate contracts	—		$	(1	)	Interest expense	$	(1	)	—
Six Months Ended June 30,
Interest rate contracts	$	2	$	(1	)	Interest expense	$	(1	)	$	(1	)

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

For

Derivatives Not designated as Hedging Instruments
The Company and Consolidated SCE&G:
	Gain (Loss) Deferred in Regulatory Accounts						Gain (Loss) Reclassified from Deferred Accounts into Income
Millions of dollars	2018		2017			Location	2018			2017
Three Months Ended June 30,
Interest rate contracts	—		$	(35	)	Interest Expense	$	(1	)	—
						Other Income	—			—
Six Months Ended June 30,
Interest rate contracts	$	65	$	(24	)	Interest Expense	$	(1	)	$	(1	)
						Other Income	115			—

Disclosure of Credit Derivatives [Table Text Block]

Derivative Contracts with Credit Contingent Features
	The Company					Consolidated SCE&G
Millions of dollars	June 30, 2018			December 31, 2017		June 30, 2018			December 31, 2017
in Net Liability Position
Aggregate fair value of derivatives in net liability position	$	24.1		$	33.7	$	10.3		$	14.7
Fair value of collateral already posted	25.3			28.9		10.9			10.1
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	$	(1.2	)	$	4.8	$	(0.6	)	$	4.6
in Net Asset Position
Aggregate fair value of derivatives in net asset position	—			$	53.5	—			$	53.5
Fair value of collateral already posted	—			—		—			—
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	—			$	53.5	—			$	53.5

Offseting Assets [Table Text Block]

Information related to the offsetting of derivative assets 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 June 30, 2018
Gross Amounts of Recognized Assets	—		$	2	$	2	$	4	—
Gross Amounts Offset in Statement of Financial Position	—		—		—		—		—
Net Amounts Presented in Statement of Financial Position	—		2		2		4		—
Gross Amounts Not Offset - Financial Instruments	—		—		—		—		—
Gross Amounts Not Offset - Cash Collateral Received	—		—		—		—		—
Net Amount	—		$	2	$	2	$	4	—
Balance sheet location
Prepayments							$	2	—
Other current assets							1		—
Other deferred debits and other assets							1		—
Total							$	4	—
As of December 31, 2017
Gross Amounts of Recognized Assets	$	54	$	1	$	4	$	59	$	54
Gross Amounts Offset in Statement of Financial Position	—		—		—		—		—
Net Amounts Presented in Statement of Financial Position	54		1		4		59		54
Gross Amounts Not Offset - Financial Instruments	—		—		—		—		—
Gross Amounts Not Offset - Cash Collateral Received	—		—		—		—		—
Net Amount	$	54	$	1	$	4	$	59	$	54
Balance sheet location
Other current assets							$	58	$	54
Other deferred debits and other assets							1		—
Total							$	59	$	54

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 June 30, 2018
Gross Amounts of Recognized Liabilities	$	23		—		$	2		$	25		$	10
Gross Amounts Offset in Statement of Financial Position	—			—		—			—			—
Net Amounts Presented in Statement of Financial Position	23			—		2			25			10
Gross Amounts Not Offset - Financial Instruments	—			—		—			—			—
Gross Amounts Not Offset - Cash Collateral Posted	(24		)	—		(1		)	(25		)	(11		)
Net Amount	$	(1	)	—		$	1		—			$	(1	)
Balance sheet location
Derivative financial instruments									$	4		$	1
Other current liabilities									1			—
Other deferred credits and other liabilities									20			9
Total									$	25		$	10
As of December 31, 2017
Gross Amounts of Recognized Liabilities	$	32		$	3	$	3		$	38		$	15
Gross Amounts Offset in Statement of Financial Position	—			—		(1		)	(1		)	—
Net Amounts Presented in Statement of Financial Position	32			3		2			37			15
Gross Amounts Not Offset - Financial Instruments	—			—		—			—			—
Gross Amounts Not Offset - Cash Collateral Posted	28			—		(1		)	27			—
Net Amount	$	60		$	3	$	1		$	64		$	15
Balance sheet location
Other current assets									$	2		—
Derivative financial instruments									7			$	2
Other deferred credits and other liabilities									28			13
Total									$	37		$	15