Risk Management, Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Pre-tax deferred losses related to Effective Cash Flow Hedges	$ 151	$ 115
Amount expected to be Recognized in earnings during the next 12 months	5
Progress Energy [Member]
Derivative [Line Items]
Pre-tax deferred losses related to Effective Cash Flow Hedges	65	232
Amount expected to be Recognized in earnings during the next 12 months	5
Progress Energy Carolinas [Member]
Derivative [Line Items]
Pre-tax deferred losses related to Effective Cash Flow Hedges		116
Progress Energy Florida [Member]
Derivative [Line Items]
Pre-tax deferred losses related to Effective Cash Flow Hedges		$ 41