Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Receivables, allowance for doubtful accounts	$ 25	$ 18
Receivables of VIEs, allowance for doubtful accounts	54	53
Regulatory assets	853	877
Regulatory assets	11,896	11,373
Current maturities of long-term debt	3,201	2,074
Long-term Debt of VIEs	$ 43,964	$ 37,495
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
Variable Interest Entity [Member]
Regulatory assets	$ 51
Regulatory assets	1,156
Current maturities of long-term debt	258	$ 125
Long-term Debt of VIEs	3,641	2,197
Duke Energy Carolinas [Member]
Receivables, allowance for doubtful accounts	2	3
Receivables of VIEs, allowance for doubtful accounts	7	7
Regulatory assets	256	305
Regulatory assets	3,040	2,766
Current maturities of long-term debt	468	356
Long-term Debt of VIEs	8,592	7,711
Progress Energy [Member]
Receivables, allowance for doubtful accounts	6	6
Receivables of VIEs, allowance for doubtful accounts	8	8
Regulatory assets	347	362
Regulatory assets	5,652	5,435
Current maturities of long-term debt	578	315
Long-term Debt of VIEs	$ 15,792	$ 13,999
Common stock, par or stated value	$ 0.01	$ 0.01
Common stock, shares authorized	100	100
Common stock, shares outstanding	100	100
Progress Energy [Member] | Variable Interest Entity [Member]
Regulatory assets	$ 51
Regulatory assets	1,156
Current maturities of long-term debt	62
Long-term Debt of VIEs	1,741	$ 479
Duke Energy Progress [Member]
Receivables, allowance for doubtful accounts	4	4
Receivables of VIEs, allowance for doubtful accounts	5	5
Regulatory assets	186	264
Regulatory assets	3,093	2,710
Current maturities of long-term debt	252	2
Long-term Debt of VIEs	6,609	6,366
Duke Energy Florida [Member]
Receivables, allowance for doubtful accounts	2	2
Receivables of VIEs, allowance for doubtful accounts	3	3
Regulatory assets	161	98
Regulatory assets	2,559	2,725
Current maturities of long-term debt	326	13
Long-term Debt of VIEs	5,802	4,253
Duke Energy Florida [Member] | Variable Interest Entity [Member]
Regulatory assets	51
Regulatory assets	1,156
Current maturities of long-term debt	62
Long-term Debt of VIEs	1,441	225
Duke Energy Ohio [Member]
Receivables, allowance for doubtful accounts	2	2
Regulatory assets	46	36
Regulatory assets	490	497
Current maturities of long-term debt	54	106
Long-term Debt of VIEs	$ 1,808	$ 1,467
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
Regulatory assets	131	102
Regulatory assets	909	716
Current maturities of long-term debt	71	547
Long-term Debt of VIEs	$ 3,566	$ 3,071
Common stock, par or stated value		$ 0.01
Common stock, shares authorized		60,000,000
Common stock, shares outstanding		53,913,701