Contingencies and Regulatory Matters (Details) - Vogtle Units Number 3 And Number 4	12 Months Ended
	Dec. 31, 2008 item MW
Nuclear Construction
Number of Westinghouse AP1000 nuclear generating units | item	2
Nominally rated generating capacity for each unit	1,100
Ownership interest of nuclear units (as a percent)	30.00%
Nominally rated generating capacity	660