Consolidated Statement of Operations (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Pension and OPEB adjustments to AOCI, tax	$ 9	$ (23)
Net unrealized gains (losses) on cash flow hedges, tax	6	(31)
Progress Energy [Member]
Pension and OPEB adjustments to AOCI, tax		27
Net unrealized gains (losses) on cash flow hedges, tax		(56)
Reclassification into earnings from cash flow hedges, tax	6	5
Reclassification of cash flow hedges to regulatory assets, tax	62
Duke Energy Progress [Member]
Net unrealized gains (losses) on cash flow hedges, tax		(28)
Reclassification of cash flow hedges to regulatory assets, tax	46
Duke Energy Florida [Member]
Net unrealized gains (losses) on cash flow hedges, tax		(15)
Reclassification of cash flow hedges to regulatory assets, tax	16
Duke Energy Ohio [Member]
Pension and OPEB adjustments to AOCI, tax	$ (8)