Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Receivables, allowance for doubtful accounts	$ 18	$ 18
Restricted receivables, allowance for doubtful accounts	$ 55	$ 53
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	689,000,000	688,000,000
Duke Energy Carolinas [Member]
Receivables, allowance for doubtful accounts	$ 2	$ 3
Restricted receivables, allowance for doubtful accounts	7	7
Progress Energy [Member]
Receivables, allowance for doubtful accounts	6	6
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	$ 4	$ 4
Restricted receivables, allowance for doubtful accounts	5	5
Duke Energy Florida [Member]
Receivables, allowance for doubtful accounts	2	2
Restricted receivables, allowance for doubtful accounts	3	3
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
Common stock, shares authorized		60,000,000
Common stock, shares outstanding		53,913,701