CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating Revenues:
Electric Domestic Regulated Revenue	$ 786	$ 817	$ 2,042	$ 2,035
Regulated Operating Revenue, Gas	123	111	584	538
Gas-nonregulated	167	165	623	598
Regulated and Unregulated Operating Revenue	1,076	1,093	3,249	3,171
Operating Expenses
Fuel used in electric generation	167	176	464	443
Purchased power	22	21	54	50
Gas purchased for resale	211	202	808	752
Other operation and maintenance	183	187	543	558
Utilities Operating Expense, Impairments	210	0	210	0
Depreciation and amortization	96	93	285	276
Other taxes	67	66	200	192
Total Operating Expenses	956	745	2,564	2,271
Operating Income	120	348	685	900
Other Income (Expense):
Other income	28	15	61	46
Other expense	(7)	(7)	(25)	(31)
Interest Expense	(95)	(88)	(270)	(255)
Allowance for equity funds used during construction	0	7	17	22
Total Other Expense	(74)	(73)	(217)	(218)
Income Before Income Tax Expense	46	275	468	682
Income Tax Expense	12	86	142	211
Net Income	$ 34	$ 189	$ 326	$ 471
Earnings Per Share, Basic and Diluted	$ 0.24	$ 1.32	$ 2.28	$ 3.29
Per Common Share Data
Weighted Average Number of Shares Outstanding, Basic and Diluted	143	143	143	143
Weighted Average Common Shares Outstanding (millions)
Dividends, Common Stock			$ 263	$ 247
Common Stock, Dividends, Per Share, Declared	$ 0.6125	$ 0.5750	$ 1.8375	$ 1.7250
SCEG
Operating Revenues:
Regulated Operating Revenue	$ 856	$ 882	$ 2,331	$ 2,292
Operating Expenses
Total Operating Expenses	733	523	1,740	1,476
Operating Income	123	359	591	816
Other Income (Expense):
Other income	21	7	36	20
Other expense	(6)	(4)	(17)	(19)
Interest Expense	(76)	(70)	(214)	(201)
Allowance for equity funds used during construction	(3)	6	13	19
Total Other Expense	(64)	(61)	(182)	(181)
Income Before Income Tax Expense	59	298	409	635
Income Tax Expense	17	94	129	202
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	42	204	280	433
Net Income (Loss) Attributable to Noncontrolling Interest	(3)	(3)	(10)	(10)
Earnings Available to Common Shareholder	39	201	270	423
Weighted Average Common Shares Outstanding (millions)
Dividends, Common Stock	81	76	240	225
Subsidiaries [Member] | SCEG
Operating Revenues:
Electric Domestic Regulated Revenue	786	817	2,042	2,035
Regulated Operating Revenue, Gas	69	64	284	252
Operating Expenses
Fuel used in electric generation	132	141	370	368
Purchased power	22	21	54	50
Gas purchased for resale	39	36	147	117
Other operation and maintenance	109	101	305	298
Utilities Operating Expense, Impairments	210	0	210	0
Depreciation and amortization	78	76	232	225
Other taxes	62	61	183	173
Affiliated Entity [Member] | SCEG
Operating Revenues:
Electric Domestic Regulated Revenue	1	1	4	4
Regulated Operating Revenue, Gas	0	0	1	1
Operating Expenses
Fuel used in electric generation	35	35	94	75
Gas purchased for resale	0	0	0	9
Other operation and maintenance	45	51	141	156
Other taxes	$ 1	$ 1	$ 4	$ 5