CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities
Net Income (Loss) Available to Common Stockholders, Basic	$ 595	$ 746	$ 538
Adjustments to reconcile net income to net cash provided from operating activities:
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		(355)
Deferred income taxes, net	242	(31)	235
Depreciation and amortization	389	368	403
Amortization of nuclear fuel	57	46	45
Allowance for equity funds used during construction	(29)	(27)	(33)
Carrying cost recovery	(17)	(12)	(9)
Cash provided (used) by changes in certain assets and liabilities:
Increase (Decrease) in Receivables	112	(188)	33
Increase (Decrease) in Income Taxes Receivable	(142)
Increase (Decrease) in Inventories	43	16	62
Increase (Decrease) in Prepaid Expense	(11)	(211)	235
Increase (Decrease) in Other Regulatory Assets	114	31	138
Increase (Decrease) in Regulatory liabilities	(2)	(1)	(104)
Increase (Decrease) in Accounts Payable	44	(78)	36
Unrecognized tax benefits, increase (decrease)	175	31	10
Increase (Decrease) in Taxes accrued	(41)	61	(24)
Increase (Decrease) in Pension and Postretirement Obligations	51	(6)	133
Increase (Decrease) in Derivative Assets and Liabilities	(9)	(9)	18
Changes in other assets	44	3	35
Changes in other liabilities	81	(23)	(15)
Net Cash Provided from Operating Activities	1,092	1,059	730
Cash Flows From Investing Activities
Property additions and construction expenditures	(1,579)	(1,153)	(1,092)
Proceeds from Sale of Property, Plant, and Equipment		647
Proceeds from investments (including derivative collateral posted)	860	1,117	347
Purchase of investments (including derivative collateral posted)	(788)	(1,018)	(475)
Payments upon interest rate contract settlement	(113)	(263)	(95)
Payments for (Proceeds from) Hedge, Investing Activities	0	10
Net Cash Used for Investing Activities	(1,620)	(660)	(1,315)
Cash Flows from Financing Activities
Proceeds from Issuance of Common Stock	0	14	98
Proceeds from issuance of long-term debt	592	491	294
Repayments of Long-term Debt	(117)	(166)	(54)
Dividends	(325)	(309)	(294)
Short-term borrowings, net	410	(387)	542
Proceeds from (Payments for) Other Financing Activities	0	(3)
Net Cash Provided From Financing Activities	560	(360)	586
Net (Decrease) Increase in Cash and Cash Equivalents	32	39	1
Cash and Cash Equivalents, January 1	176	137	136
Cash and Cash Equivalents, December 31	208	176	137
Supplemental Cash Flow Information
Cash paid for-Interest (net of capitalized interest )	328	306	301
Cash paid for-Income taxes	229	184	299
Proceeds from Income Tax Refunds	166
Cash Flow, Noncash Investing and Financing Activities Disclosure
Accrued construction expenditures	109	244	180
Capital Lease Obligations Incurred	15	6	5
SCE&G
Cash Flows from Operating Activities
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	526	480	458
Adjustments to reconcile net income to net cash provided from operating activities:
Deferred income taxes, net	207	8	187
Depreciation and amortization	310	294	318
Amortization of nuclear fuel	57	46	45
Allowance for equity funds used during construction	(26)	(25)	(28)
Carrying cost recovery	(17)	(12)	(9)
Cash provided (used) by changes in certain assets and liabilities:
Increase (Decrease) in Receivables	47	(85)	(51)
Increase (Decrease) in Due from Affiliates, Current	(3)	16	(90)
Increase (Decrease) in Income Taxes Receivable	(53)
Increase (Decrease) in Inventories	35	24	52
Increase (Decrease) in Prepaid Expense	4	(70)	89
Increase (Decrease) in Other Regulatory Assets	94	29	116
Increase (Decrease) in Regulatory liabilities	(5)	(3)	(103)
Increase (Decrease) in Accounts Payable	8	11	(49)
Unrecognized tax benefits, increase (decrease)	192	31	10
Increase (Decrease) in Due to Affiliates, Current	13	(17)	63
Increase (Decrease) in Taxes accrued	(104)	129	(53)
Increase (Decrease) in Pension and Postretirement Obligations	39	(5)	106
Changes in other assets	99	(57)	15
Changes in other liabilities	58	(28)	16
Increase (Decrease) in Due to Affiliates	(1)	(6)	(9)
Net Cash Provided from Operating Activities	922	1,078	641
Cash Flows From Investing Activities
Property additions and construction expenditures	(1,399)	(1,008)	(934)
Proceeds from investments (including derivative collateral posted)	794	975	275
Purchase of investments (including derivative collateral posted)	(740)	(887)	(381)
Payments upon interest rate contract settlement	(113)	(263)	(95)
Payments for (Proceeds from) Hedge, Investing Activities		10
Proceeds from Investment In Affiliate	9	71
Investment In Affiliate			(80)
Net Cash Used for Investing Activities	(1,449)	(1,102)	(1,215)
Cash Flows from Financing Activities
Proceeds from issuance of long-term debt	494	491	294
Repayments of Long-term Debt	(112)	(11)	(48)
Dividends	(301)	(285)	(260)
Short-term borrowings, net	384	(289)	458
Short-term borrowings-affiliate,net	(4)	(50)	56
Contributions from parent	100	204	89
Payment to Parent representing the return of Contribution Proceeds	0	(4)	(7)
Proceeds from (Payments for) Other Financing Activities	0	(2)
Net Cash Provided From Financing Activities	561	54	582
Net (Decrease) Increase in Cash and Cash Equivalents	34	30	8
Cash and Cash Equivalents, January 1	130	100	92
Cash and Cash Equivalents, December 31	164	130	100
Supplemental Cash Flow Information
Cash paid for-Interest (net of capitalized interest )	251	228	210
Cash paid for-Income taxes	289	89	177
Proceeds from Income Tax Refunds	189	84
Cash Flow, Noncash Investing and Financing Activities Disclosure
Accrued construction expenditures	95	230	151
Capital Lease Obligations Incurred	$ 14	$ 6	$ 5