Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Progress Energy [Member]	Dec. 31, 2012 Progress Energy [Member]	Dec. 31, 2013 Duke Energy Progress [Member]	Dec. 31, 2012 Duke Energy Progress [Member]	Dec. 31, 2013 Duke Energy Florida [Member]	Dec. 31, 2012 Duke Energy Florida [Member]	Dec. 31, 2013 Duke Energy Ohio [Member]	Dec. 31, 2012 Duke Energy Ohio [Member]	Dec. 31, 2013 Duke Energy Indiana [Member]	Dec. 31, 2012 Duke Energy Indiana [Member]
Receivables, allowance for doubtful accounts	$ 30	$ 34	$ 14	$ 16	$ 10	$ 9	$ 4	$ 7	$ 2	$ 2	$ 1	$ 1
Restricted receivables, allowance for doubtful accounts	$ 43	$ 44
Common stock, par value	$ 0.001		$ 0.01						$ 8.50	$ 8.50
Common stock, shares authorized	2,000,000,000	2,000,000,000	100	100	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	706,000,000	704,000,000	100	100	160,000,000	160,000,000	100	100	89,663,086	89,663,086	59,913,701	59,913,701