COMMITMENTS AND CONTINGENCIES Nuclear (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CapitalCosts [Member]
ForecastedCapitalCostsApproved2012Order	$ 4,548
Grossconstructioncosts [Member]
ForecastedCapitalCostsApproved2012Order	5,755
SCE&G
Additional ownership in new units		0.00%	0.00%	0.00%
Total Construction Milestones	146
Milestone Schedule Contingency Period	18
Completed Construction Milestones	101
MIlestones Extended	Three
Additional ownership in new units, dollars	500
Summer Station New Units [Domain]
jointly owned utility plant ownership, construction financing cost	2,425
Jointly Owned Utility Plant, Construction Delay, Preliminary Cost Estimate	660
Jointly Owned Utility Plant, Owner's Cost Per Month Caused by Delays, Estimated	$ 10