Document and Entity Information	3 Months Ended
	Mar. 31, 2012	May 03, 2012
Document and Entity Information [Line Items]
Entity registrant name	PROGRESS ENERGY INC
Entity central index key	0001094093
Document type	10-Q
Document period end date	Mar. 31, 2012
Amendment flag	true
Amendment description	This Amendment No. 1 on Form 10-Q/A (this Amendment) amends the Quarterly Report on Form 10-Q of Progress Energy, Inc., Carolina Power & Light Company d/b/a Progress Energy Carolinas, Inc. (PEC) and Florida Power Corporation d/b/a Progress Energy Florida, Inc. (PEF) (collectively, the Progress Registrants) for the quarterly period ended March 31, 2012, originally filed with the Securities and Exchange Commission on May 8, 2012 (the Original Filing). This Amendment is being filed solely to include certain Extensible Business Reporting Language (XBRL) information in Exhibit 101 that was inadvertently excluded from the timely filed Original Filing, in accordance with Rule 405 of Regulation S-T.
Entity current reporting status	Yes
Entity voluntary filers	No
Current fiscal year end date	--12-31
Entity filer category	Large Accelerated Filer
Entity well known seasoned issuer	Yes
Entity common stock shares outstanding		296,021,515
Document fiscal year focus	2012
Document fiscal period focus	Q1
PEC
Document and Entity Information [Line Items]
Entity registrant name	Carolina Power & Light Co
Entity central index key	0000017797
Current fiscal year end date	--12-31
Entity filer category	Non-accelerated Filer
PEF
Document and Entity Information [Line Items]
Entity registrant name	Florida Power Corp
Entity central index key	0000037637
Current fiscal year end date	--12-31
Entity filer category	Non-accelerated Filer