Debt and Credit Facilities (Annual Maturities) (Details) (USD $) In Millions, unless otherwise specified						9 Months Ended											9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Other Debt Obligations [Member]	Sep. 30, 2013 Duke Energy Carolinas [Member]	Dec. 31, 2012 Duke Energy Carolinas [Member]	Sep. 30, 2013 Duke Energy Carolinas [Member] 5.750% Debt Maturing November 2013 First Mortgage Bonds [Member]	Sep. 30, 2013 Progress Energy [Member]	Dec. 31, 2012 Progress Energy [Member]	Sep. 30, 2013 Duke Energy Progress [Member]	Dec. 31, 2012 Duke Energy Progress [Member]	Sep. 30, 2013 Duke Energy Florida [Member]	Dec. 31, 2012 Duke Energy Florida [Member]	Sep. 30, 2013 Duke Energy Ohio [Member]	Dec. 31, 2012 Duke Energy Ohio [Member]	Sep. 30, 2013 Duke Energy Indiana [Member]	Dec. 31, 2012 Duke Energy Indiana [Member]	Sep. 30, 2013 Parent Company [Member] 6.300% Debt Maturing February 2014 Unsecured Debt [Member]	Sep. 30, 2013 Parent Company [Member] 3.950% Debt Maturing September 2014 Unsecured Debt [Member]	Sep. 30, 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	$ 2,307	$ 3,110	$ 357	$ 447	$ 406	$ 400	$ 317	$ 843	$ 7	$ 407	$ 11	$ 435	$ 5	$ 261	$ 4	$ 405	$ 750	$ 500	$ 300
Interest rate						5.75%											6.30%	3.95%	6.05%
Maturity date						Nov. 30, 2013											Feb. 28, 2014	Sep. 30, 2014	Mar. 31, 2014