AFFILIATED TRANSACTIONS Related Party Transactions (Tables)

9 Months Ended

Sep. 30, 2018

Related Party Transaction [Line Items]

Schedule of Related Party Transactions [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
Millions of Dollars	2018		2017		2018		2017
Purchases from Canadys Refined Coal, LLC	$	45.2	$	47.5	$	122.5	$	144.9
Sales to Canadys Refined Coal, LLC	44.9		47.2		121.8		144.0

Millions of Dollars	September 30, 2018		December 31, 2017
Receivable from Canadys Refined Coal, LLC	$	8.5	$	4.9
Payable to Canadys Refined Coal, LLC	8.5		4.9

	Three Months Ended September 30,				Nine Months Ended September 30,
Millions of Dollars	2018		2017		2018		2017
Purchases from SCANA Energy	$	35.0	$	35.3	$	95.0	$	93.4
Direct and Allocated Costs from SCANA Services	72.9		78.1		208.3		233.6

Millions of Dollars	September 30, 2018		December 31, 2017
Payable to SCANA Energy	$	10.6	$	10.0
Payable to SCANA Services	42.8		42.0

Related Party Transactions Disclosure [Text Block]

AFFILIATED TRANSACTIONS

The Company and Consolidated SCE&G:

SCE&G owns 40% of Canadys Refined Coal, LLC, which is involved in the manufacturing and sale of refined coal to reduce emissions. SCE&G accounts for this investment using the equity method. The net of the total purchases and total sales are recorded in Other expenses on the consolidated statements of income (for the Company) and of comprehensive income (for Consolidated SCE&G).

	Three Months Ended September 30,				Nine Months Ended September 30,
Millions of Dollars	2018		2017		2018		2017
Purchases from Canadys Refined Coal, LLC	$	45.2	$	47.5	$	122.5	$	144.9
Sales to Canadys Refined Coal, LLC	44.9		47.2		121.8		144.0

Millions of Dollars	September 30, 2018		December 31, 2017
Receivable from Canadys Refined Coal, LLC	$	8.5	$	4.9
Payable to Canadys Refined Coal, LLC	8.5		4.9

Consolidated SCE&G:

SCE&G purchases natural gas and related pipeline capacity from SCANA Energy to serve its retail gas customers and certain electric generation requirements. 

SCANA Services, on behalf of itself and its parent company, provides the following services to Consolidated SCE&G, which are rendered at direct or allocated cost: information systems, telecommunications, customer support, marketing and sales, human resources, corporate compliance, purchasing, financial, risk management, public affairs, legal, investor relations, gas supply and capacity management, strategic planning, general administrative, and retirement benefits. In addition, SCANA Services processes and pays invoices for Consolidated SCE&G and is reimbursed. Costs for these services include amounts capitalized. Amounts expensed are primarily recorded in Other operation and maintenance - nonconsolidated affiliate and Other Income (Expense), net on the consolidated statements of comprehensive income.

Consolidated SCE&G has provided $71.0 million in funding to a rabbi trust consolidated with SCANA in connection with the potential change in control arising from the Merger Agreement. This funding is recorded as long-term Other affiliate assets on the condensed consolidated balance sheet of Consolidated SCE&G.

	Three Months Ended September 30,				Nine Months Ended September 30,
Millions of Dollars	2018		2017		2018		2017
Purchases from SCANA Energy	$	35.0	$	35.3	$	95.0	$	93.4
Direct and Allocated Costs from SCANA Services	72.9		78.1		208.3		233.6

Millions of Dollars	September 30, 2018		December 31, 2017
Payable to SCANA Energy	$	10.6	$	10.0
Payable to SCANA Services	42.8		42.0

Consolidated SCE&G's money pool borrowings from an affiliate are described in Note 5. Certain disclosures regarding SCE&G's participation in SCANA's noncontributory defined benefit pension plan and unfunded postretirement health care and life insurance programs are included in Note 9.

SCEG

Related Party Transaction [Line Items]

Schedule of Related Party Transactions [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
Millions of Dollars	2018		2017		2018		2017
Purchases from SCANA Energy	$	35.0	$	35.3	$	95.0	$	93.4
Direct and Allocated Costs from SCANA Services	72.9		78.1		208.3		233.6

Millions of Dollars	September 30, 2018		December 31, 2017
Payable to SCANA Energy	$	10.6	$	10.0
Payable to SCANA Services	42.8		42.0

	Three Months Ended September 30,				Nine Months Ended September 30,
Millions of Dollars	2018		2017		2018		2017
Purchases from Canadys Refined Coal, LLC	$	45.2	$	47.5	$	122.5	$	144.9
Sales to Canadys Refined Coal, LLC	44.9		47.2		121.8		144.0

Millions of Dollars	September 30, 2018		December 31, 2017
Receivable from Canadys Refined Coal, LLC	$	8.5	$	4.9
Payable to Canadys Refined Coal, LLC	8.5		4.9

Related Party Transactions Disclosure [Text Block]

AFFILIATED TRANSACTIONS

The Company and Consolidated SCE&G:

SCE&G owns 40% of Canadys Refined Coal, LLC, which is involved in the manufacturing and sale of refined coal to reduce emissions. SCE&G accounts for this investment using the equity method. The net of the total purchases and total sales are recorded in Other expenses on the consolidated statements of income (for the Company) and of comprehensive income (for Consolidated SCE&G).

	Three Months Ended September 30,				Nine Months Ended September 30,
Millions of Dollars	2018		2017		2018		2017
Purchases from Canadys Refined Coal, LLC	$	45.2	$	47.5	$	122.5	$	144.9
Sales to Canadys Refined Coal, LLC	44.9		47.2		121.8		144.0

Millions of Dollars	September 30, 2018		December 31, 2017
Receivable from Canadys Refined Coal, LLC	$	8.5	$	4.9
Payable to Canadys Refined Coal, LLC	8.5		4.9

Consolidated SCE&G:

SCE&G purchases natural gas and related pipeline capacity from SCANA Energy to serve its retail gas customers and certain electric generation requirements. 

SCANA Services, on behalf of itself and its parent company, provides the following services to Consolidated SCE&G, which are rendered at direct or allocated cost: information systems, telecommunications, customer support, marketing and sales, human resources, corporate compliance, purchasing, financial, risk management, public affairs, legal, investor relations, gas supply and capacity management, strategic planning, general administrative, and retirement benefits. In addition, SCANA Services processes and pays invoices for Consolidated SCE&G and is reimbursed. Costs for these services include amounts capitalized. Amounts expensed are primarily recorded in Other operation and maintenance - nonconsolidated affiliate and Other Income (Expense), net on the consolidated statements of comprehensive income.

Consolidated SCE&G has provided $71.0 million in funding to a rabbi trust consolidated with SCANA in connection with the potential change in control arising from the Merger Agreement. This funding is recorded as long-term Other affiliate assets on the condensed consolidated balance sheet of Consolidated SCE&G.

	Three Months Ended September 30,				Nine Months Ended September 30,
Millions of Dollars	2018		2017		2018		2017
Purchases from SCANA Energy	$	35.0	$	35.3	$	95.0	$	93.4
Direct and Allocated Costs from SCANA Services	72.9		78.1		208.3		233.6

Millions of Dollars	September 30, 2018		December 31, 2017
Payable to SCANA Energy	$	10.6	$	10.0
Payable to SCANA Services	42.8		42.0

Consolidated SCE&G's money pool borrowings from an affiliate are described in Note 5. Certain disclosures regarding SCE&G's participation in SCANA's noncontributory defined benefit pension plan and unfunded postretirement health care and life insurance programs are included in Note 9.