Variable Interest Entities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			12 Months Ended										12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012 DukeNet [Member] Variable Interest Entity, Not Primary Beneficiary [Member]	Dec. 31, 2011 Cinergy Receivables [Member] Variable Interest Entity, Primary Beneficiary [Member]	Dec. 31, 2013 Cinergy Receivables [Member] Variable Interest Entity, Primary Beneficiary [Member]	Dec. 31, 2012 Duke Energy Carolinas [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member] DERF [Member] Variable Interest Entity, Primary Beneficiary [Member]	Dec. 31, 2013 Progress Energy [Member] FPC Capital I Trust [Member] Variable Interest Entity, Not Primary Beneficiary [Member]	Dec. 31, 2013 Duke Energy Progress [Member]	Dec. 31, 2012 Duke Energy Progress [Member]	Dec. 31, 2013 Duke Energy Progress [Member] DEPR [Member] Variable Interest Entity, Primary Beneficiary [Member]	Dec. 31, 2012 Duke Energy Florida [Member]	Dec. 31, 2013 Duke Energy Ohio [Member]	Dec. 31, 2013 Duke Energy Ohio [Member] Cinergy Receivables [Member]	Dec. 31, 2013 Duke Energy Ohio [Member] Other VIEs [Member]	Dec. 31, 2013 Duke Energy Indiana [Member]	Dec. 31, 2012 Duke Energy Indiana [Member]	Dec. 31, 2013 Duke Energy Indiana [Member] Cinergy Receivables [Member]
Variable Interest Entity [Line Items]
Minimum Equity Balance required by Cinergy Receivables					$ 3
Fixed rate used when selling receivables														1.00%				1.00%
Equity ownership interest			50.00%
Line of credit facility, expiration date	Dec. 01, 2018
Ownership interest in OVEC															9.00%
Debt instrument, face amount	4,023	5,343				650	400	300	800	1,000	300	650	450			500	250
Contributions from parent				$ 6