Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2012	Feb. 25, 2013	Jun. 30, 2012
Document Type	10-K
Document Period End Date	Dec. 31, 2012
Amendment Flag	false
Entity Registrant Name	Duke Energy Corporation
Entity Central Index Key	0001326160
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		704,653,826
Entity Public Float			$ 30,778,000,000
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Duke Energy Carolinas [Member]
Entity Registrant Name	Duke Energy Carolinas, LLC
Entity Central Index Key	0000030371
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Progress Energy [Member]
Entity Registrant Name	PROGRESS ENERGY INC
Entity Central Index Key	0001094093
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	No
Progress Energy Carolinas [Member]
Entity Registrant Name	Carolina Power & Light Co
Entity Central Index Key	0000017797
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Progress Energy Florida [Member]
Entity Registrant Name	Florida Power Corp
Entity Central Index Key	0000037637
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Duke Energy Ohio [Member]
Entity Registrant Name	Duke Energy Ohio, Inc.
Entity Central Index Key	0000020290
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Well-known Seasoned Issuer	No
Duke Energy Indiana [Member]
Entity Registrant Name	Duke Energy Indiana, Inc.
Entity Central Index Key	0000081020
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Well-known Seasoned Issuer	No