Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts and Other Receivables, Current	$ 13	$ 14
Regulatory assets	1,031	1,023
Current Assets: Other	425	458
Regulatory assets	12,838	12,878
Current maturities of long-term debt	1,977	2,319
Long-term Debt of VIEs	$ 47,021	$ 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 Receivable, Current	$ 57	$ 54
Regulatory assets	53	50
Regulatory assets	1,131	1,142
Current maturities of long-term debt	281	260
Long-term Debt of VIEs	4,108	3,587
Duke Energy Carolinas [Member]
Allowance for Doubtful Accounts and Other Receivables, Current	2	2
Regulatory assets	233	238
Current Assets: Other	65	37
Regulatory assets	3,098	3,159
Current maturities of long-term debt	404	116
Long-term Debt of VIEs	8,787	9,187
Duke Energy Carolinas [Member] | Variable Interest Entity [Member]
Allowance for Doubtful Accounts Receivable, Current	7	7
Progress Energy [Member]
Allowance for Doubtful Accounts and Other Receivables, Current	3	6
Regulatory assets	447	401
Current Assets: Other	252	148
Regulatory assets	5,815	5,722
Current maturities of long-term debt	521	778
Long-term Debt of VIEs	$ 16,454	$ 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 Receivable, Current	$ 7	$ 7
Regulatory assets	53	50
Regulatory assets	1,131	1,142
Current maturities of long-term debt	55	62
Long-term Debt of VIEs	1,713	1,741
Duke Energy Progress [Member]
Allowance for Doubtful Accounts and Other Receivables, Current	1	4
Regulatory assets	187	188
Current Assets: Other	102	57
Regulatory assets	3,338	3,243
Current maturities of long-term debt	202	452
Long-term Debt of VIEs	6,409	6,409
Duke Energy Progress [Member] | Variable Interest Entity [Member]
Allowance for Doubtful Accounts Receivable, Current	5	5
Duke Energy Florida [Member]
Allowance for Doubtful Accounts and Other Receivables, Current	2	2
Regulatory assets	260	213
Current Assets: Other	104	125
Regulatory assets	2,476	2,480
Current maturities of long-term debt	319	326
Long-term Debt of VIEs	6,662	5,799
Duke Energy Florida [Member] | Variable Interest Entity [Member]
Allowance for Doubtful Accounts Receivable, Current	2	2
Regulatory assets	53	50
Current Assets: Other	14	53
Regulatory assets	1,131	1,142
Current maturities of long-term debt	55	62
Long-term Debt of VIEs	1,414	1,442
Duke Energy Ohio [Member]
Allowance for Doubtful Accounts and Other Receivables, Current	2	2
Regulatory assets	21	37
Current Assets: Other	34	37
Regulatory assets	525	520
Current maturities of long-term debt	1	1
Long-term Debt of VIEs	$ 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	89,663,086	89,663,086
Duke Energy Indiana [Member]
Allowance for Doubtful Accounts and Other Receivables, Current	$ 1	$ 1
Regulatory assets	156	149
Current Assets: Other	35	45
Regulatory assets	1,066	1,073
Current maturities of long-term debt	3	3
Long-term Debt of VIEs	3,631	3,633
Piedmont Natural Gas [Member]
Allowance for Doubtful Accounts and Other Receivables, Current	5	3
Regulatory assets	98	124
Current Assets: Other	21	21
Regulatory assets	350	373
Current maturities of long-term debt	35	35
Long-term Debt of VIEs	$ 1,786	$ 1,786
Common stock, par or stated value	$ 0	$ 0
Common stock, shares authorized	100	100
Common stock, shares outstanding	100	100