Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Receivables, allowance for doubtful accounts	$ 17	$ 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	688,000,000	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	6	8
Restricted receivables, allowance for doubtful accounts	$ 9	$ 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	$ 4	$ 7
Restricted receivables, allowance for doubtful accounts	6	$ 5
Common stock, shares authorized		200,000,000
Common stock, shares outstanding		160,000,000
Duke Energy Florida [Member]
Receivables, allowance for doubtful accounts	2	$ 2
Restricted receivables, allowance for doubtful accounts	3	$ 3
Common stock, shares authorized		60,000,000
Common stock, shares outstanding		100
Duke Energy Ohio [Member]
Receivables, allowance for doubtful accounts	$ 3	$ 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	$ 2	$ 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