CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Revenues:
Electric Domestic Regulated Revenue	$ 583	$ 545
Regulated Operating Revenue, Gas	382	277
Gas-nonregulated	346	285
Regulated and Unregulated Operating Revenue	1,311	1,107
Operating Expenses [Abstract]
Fuel used in electric generation	186	181
Purchased power	7	6
Gas purchased for resale	501	366
Other operation and maintenance	176	175
Depreciation and amortization	93	89
Other taxes	55	52
Total Operating Expenses	1,018	869
Operating Income	293	238
Other Income (Expense):
Interest Expense	(75)	(72)
Other income	13	14
Other expenses	(12)	(10)
Allowance for equity funds used during construction	4	3
Total Other Expense	(70)	(65)
Income Before Income Tax Expense	223	173
Income Tax Expense	72	52
Income Available to Common Shareholders	151	121
Per Common Share Data
Basic Earnings Per Share of Common Stock (in dollars per share)	$ 1.13	$ 0.93
Diluted Earnings Per Share of Common Stock (in dollars per share)	$ 1.11	$ 0.91
Weighted Average Common Shares Outstanding (millions)
Weighted Average Number of Shares Outstanding, Basic	134.4	130.3
Weighted Average Number of Shares Outstanding, Diluted	136.1	132.2
Dividends Declared Per Share of Common Stock (in dollars per share)	$ 0.5075	$ 0.495
SCEG
Operating Revenues:
Electric Domestic Regulated Revenue	585	547
Regulated Operating Revenue, Gas	143	116
Total Operating Revenues	728	663
Operating Expenses [Abstract]
Fuel used in electric generation	188	183
Purchased power	7	6
Gas purchased for resale	77	59
Other operation and maintenance	138	138
Depreciation and amortization	77	73
Other taxes	50	48
Total Operating Expenses	537	507
Operating Income	191	156
Other Income (Expense):
Interest Expense	(55)	(51)
Other expenses	(4)	(4)
Allowance for equity funds used during construction	4	3
Total Other Expense	(55)	(52)
Income Before Income Tax Expense	136	104
Income Tax Expense	44	32
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	92	72
Net Income (Loss) Attributable to Noncontrolling Interest	(3)	(3)
Net Income (Loss) Attributable to Parent	89	69
Weighted Average Common Shares Outstanding (millions)
Dividends, Common Stock, Cash	$ 64	$ 53