Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Allowance for doubtful accounts - receivables	$ 13	$ 14
Regulatory assets, current	1,192	1,023
Other, current assets	436	458
Regulatory assets, noncurrent	12,808	12,878
Current maturities of long-term debt	3,472	2,319
Long-Term Debt	$ 46,043	$ 45,576
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	700,000,000	700,000,000
Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	$ 56	$ 54
Regulatory assets, current	52	50
Regulatory assets, noncurrent	1,121	1,142
Current maturities of long-term debt	212	260
Long-Term Debt	4,018	3,587
Duke Energy Carolinas [Member]
Allowance for doubtful accounts - receivables	2	2
Regulatory assets, current	249	238
Other, current assets	34	37
Regulatory assets, noncurrent	3,060	3,159
Current maturities of long-term debt	704	116
Long-Term Debt	8,520	9,187
Duke Energy Carolinas [Member] | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	7	7
Progress Energy [Member]
Allowance for doubtful accounts - receivables	4	6
Regulatory assets, current	533	401
Other, current assets	196	148
Regulatory assets, noncurrent	5,853	5,722
Current maturities of long-term debt	1,022	778
Long-Term Debt	$ 15,950	$ 15,590
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]
Allowance for doubtful accounts - receivables of VIEs	$ 7	$ 7
Regulatory assets, current	52	50
Regulatory assets, noncurrent	1,121	1,142
Current maturities of long-term debt	55	62
Long-Term Debt	1,711	1,741
Duke Energy Progress [Member]
Allowance for doubtful accounts - receivables	1	4
Regulatory assets, current	212	188
Other, current assets	76	57
Regulatory assets, noncurrent	3,379	3,243
Current maturities of long-term debt	203	452
Long-Term Debt	6,407	6,409
Duke Energy Progress [Member] | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	5	5
Duke Energy Florida [Member]
Allowance for doubtful accounts - receivables	3	2
Regulatory assets, current	321	213
Other, current assets	50	125
Regulatory assets, noncurrent	2,474	2,480
Current maturities of long-term debt	819	326
Long-Term Debt	6,160	5,799
Duke Energy Florida [Member] | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	2	2
Regulatory assets, current	52	50
Other, current assets	33	53
Regulatory assets, noncurrent	1,121	1,142
Current maturities of long-term debt	55	62
Long-Term Debt	1,414	1,442
Duke Energy Ohio [Member]
Allowance for doubtful accounts - receivables	2	2
Regulatory assets, current	42	37
Other, current assets	38	37
Regulatory assets, noncurrent	519	520
Current maturities of long-term debt	1	1
Long-Term Debt	$ 1,951	$ 1,858
Common stock, par or stated value	$ 8.50	$ 8.50
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares outstanding	90,000,000	90,000,000
Duke Energy Indiana [Member]
Allowance for doubtful accounts - receivables	$ 1	$ 1
Regulatory assets, current	159	149
Other, current assets	88	45
Regulatory assets, noncurrent	1,100	1,073
Current maturities of long-term debt	3	3
Long-Term Debt	3,631	3,633
Piedmont Natural Gas [Member]
Allowance for doubtful accounts - receivables	4	3
Regulatory assets, current	119	124
Other, current assets	87	21
Regulatory assets, noncurrent	346	373
Current maturities of long-term debt	35	35
Long-Term Debt	$ 1,911	$ 1,786
Common stock, shares authorized	100	100
Common stock, shares outstanding	100	100