Condensed Consolidated Statement of Operations (Unaudited) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension and OPEB related adjustments to AOCI, tax		$ 10	$ (2)	$ 7
Net unrealized gains (losses) on cash flow hedges, tax	(1)	(1)	17	(10)
Progress Energy [Member]
Reclassification of cash flow hedges to regulatory assets, tax	0	62	0	62
Duke Energy Progress [Member]
Reclassification of cash flow hedges to regulatory assets, tax	0	46	0	46
Duke Energy Florida [Member]
Reclassification of cash flow hedges to regulatory assets, tax	$ 0	$ 17	$ 0	$ 17