Statements of Equity - Progress Energy Florida (USD $) In Millions	Total	Progress Energy Florida [Member]	Common Stock [Member] Progress Energy Florida [Member]	Retained Earnings [Member]	Retained Earnings [Member] Progress Energy Florida [Member]	Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member]	Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] Progress Energy Florida [Member]	Parent [Member]
Balance at Dec. 31, 2009		$ 4,490	$ 1,744		$ 2,743		$ 3
Net income	1,323	453		1,320	453			1,320
Other comprehensive income	373	(7)				4	(7)	374
Stock-based compensation expense		6	6
Dividends paid to parent		(50)			(50)
Preferred stock dividends at stated rate		(2)			(2)
Balance at Dec. 31, 2010		4,890	1,750		3,144		(4)
Net income	513	102
Balance at Mar. 31, 2011
Balance at Dec. 31, 2010		4,890	1,750		3,144		(4)
Net income	1,714	314		1,706	314			1,706
Other comprehensive income	(243)	(23)				(53)	(23)	(236)
Stock-based compensation expense		7	7
Dividends paid to parent		(510)			(510)
Preferred stock dividends at stated rate		(2)			(2)
Tax dividend		(1)			(1)
Balance at Dec. 31, 2011	22,772	4,675	1,757		2,945		(27)
Balance at Sep. 30, 2011
Net income	290	(104)
Balance at Dec. 31, 2011	22,772	4,675
Net income	299	128
Balance at Mar. 31, 2012
Balance at Dec. 31, 2011	22,772	4,675	1,757		2,945		(27)
Net income	1,782	266		1,768	266			1,768
Other comprehensive income	(76)	27				(29)	27	(72)
Stock-based compensation expense		5	5
Dividends paid to parent		(170)			(170)
Preferred stock dividends at stated rate		(2)			(2)
Tax dividend		(2)			(2)
Balance at Dec. 31, 2012	40,863	4,799	1,762		3,037
Balance at Sep. 30, 2012
Net income	437	(45)
Balance at Dec. 31, 2012	$ 40,863	$ 4,799