Debt and Credit Facilities (Annual Maturities) (Details) (USD $) In Millions, unless otherwise specified											12 Months Ended							12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2013 Other Debt Obligations [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member]	Dec. 31, 2012 Duke Energy Carolinas [Member]	Dec. 31, 2013 Progress Energy [Member]	Dec. 31, 2012 Progress Energy [Member]	Dec. 31, 2013 Duke Energy Progress [Member]	Dec. 31, 2012 Duke Energy Progress [Member]	Dec. 31, 2013 Duke Energy Progress [Member] 0.105% Debt Maturing January 2014 Tax Exempt Bonds [Member]	Dec. 31, 2013 Duke Energy Florida [Member]	Dec. 31, 2012 Duke Energy Florida [Member]	Dec. 31, 2013 Duke Energy Ohio [Member]	Dec. 31, 2012 Duke Energy Ohio [Member]	Dec. 31, 2013 Duke Energy Indiana [Member]	Dec. 31, 2012 Duke Energy Indiana [Member]	Dec. 31, 2013 Parent Company [Member] 6.300% Debt Maturing February 2014 Unsecured Debt [Member]	Dec. 31, 2013 Parent Company [Member] 3.950% Debt Maturing September 2014 Unsecured Debt [Member]	Dec. 31, 2013 PGN Parent [Member] 6.050% Debt Maturing March 2014 Unsecured Debt [Member]
Current Maturities Of Long Term Debt [Abstract]
Current maturities of long-term debt	$ 2,104		$ 3,110	$ 387	$ 47	$ 406	$ 485	$ 843	$ 174	$ 407	$ 167	$ 11	$ 435	$ 47	$ 261	$ 5	$ 405	$ 750	$ 500	$ 300
Interest rate											0.105%							6.30%	3.95%	6.05%
Maturity date											Jan. 01, 2014							Feb. 28, 2014	Sep. 30, 2014	Mar. 31, 2014
Long-term Debt, Fiscal Year Maturity [Abstract]
2014	2,104	[1]			47		485		174			11		47		5
2015	2,634	[1]			507		1,264		702			562		157		5
2016	2,975	[1]			756		614		302			12		56		480
2017	1,342	[1]			116		265		3			262		2		3
2018	3,235	[1]			1,505		603		59			544		3		153
Thereafter	25,899	[1]			5,505		10,884		3,995			3,495		1,923		3,150
Total long-term debt, including current maturities	$ 38,189	[1]			$ 8,436		$ 14,115		$ 5,235			$ 4,886		$ 2,188		$ 3,796

[1] Excludes $2,067 million in purchase accounting adjustments related to the merger with Progress Energy. See Note 2 for additional information.