Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Receivables, allowance for doubtful accounts	$ 16	$ 17
Restricted receivables, allowance for doubtful accounts	54	51
Common stock, par or stated value	$ 0.001	$ 0.001
Common stock, shares authorized	2,000,000,000	2,000,000,000
Common stock, shares outstanding	708,000,000	707,000,000
Duke Energy Carolinas [Member]
Receivables, allowance for doubtful accounts	3	3
Restricted receivables, allowance for doubtful accounts	6	6
Progress Energy [Member]
Receivables, allowance for doubtful accounts	7	8
Restricted receivables, allowance for doubtful accounts	8	8
Common stock, par or stated value	$ 0.01	$ 0.01
Common stock, shares authorized	100	100
Common stock, shares outstanding	100	100
Duke Energy Progress [Member]
Receivables, allowance for doubtful accounts	6	7
Restricted receivables, allowance for doubtful accounts	4	5
Common stock, par or stated value	$ 0	$ 0
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares outstanding	160,000,000	160,000,000
Duke Energy Florida [Member]
Receivables, allowance for doubtful accounts	2	2
Restricted receivables, allowance for doubtful accounts	3	3
Common stock, par or stated value	$ 0	$ 0
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares outstanding	100	100
Duke Energy Ohio [Member]
Receivables, allowance for doubtful accounts	2	2
Common stock, par or stated value	$ 8.50	$ 8.50
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares outstanding	89,663,086	89,663,086
Duke Energy Indiana [Member]
Receivables, allowance for doubtful accounts	$ 1	$ 1
Common stock, par or stated value	$ 0.01	$ 0.01
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares outstanding	53,913,701	53,913,701