Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012 Progress Energy [Member]	Dec. 31, 2011 Progress Energy [Member]	Dec. 31, 2012 Progress Energy Carolinas [Member]	Dec. 31, 2011 Progress Energy Carolinas [Member]	Dec. 31, 2012 Progress Energy Florida [Member]	Dec. 31, 2011 Progress Energy Florida [Member]	Dec. 31, 2012 Duke Energy Ohio [Member]	Dec. 31, 2011 Duke Energy Ohio [Member]	Dec. 31, 2012 Duke Energy Indiana [Member]	Dec. 31, 2011 Duke Energy Indiana [Member]
Receivables, allowance for doubtful accounts	$ 16	$ 27	$ 9	$ 9	$ 7	$ 18	$ 2	$ 16	$ 1	$ 1
Common stock, par value	$ 0.01						$ 8.50	$ 8.50
Common stock, shares authorized	100	500,000,000	200,000,000	200,000,000	60,000,000	60,000,000	120,000,000	120,000,000	60,000,000	60,000,000
Common stock, shares outstanding	100	295,000,000	160,000,000	160,000,000	100	100	89,663,086	89,663,086	59,913,701	59,913,701
Common stock, shares issued	100	295,000,000	160,000,000	160,000,000	100	100