Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts - receivables	$ 28	$ 22
Regulatory Assets: Current	1,770	1,796
Current Assets: Other	1,000	764
Other Noncurrent Assets: Regulatory assets	13,413	13,222
Other, noncurrent assets	3,315	3,289
Current maturities of long-term debt	5,077	3,141
Long-Term Debt	$ 56,311	$ 54,985
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized	2,000,000,000	2,000,000,000
Common stock, shares outstanding	735,000,000	733,000,000
Other, noncurrent liabilities	$ 1,669	$ 1,581
Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	61	54
Regulatory Assets: Current	53	52
Current Assets: Other	300	242
Other Noncurrent Assets: Regulatory assets	980	989
Other, noncurrent assets	87	110
Current maturities of long-term debt	216	216
Long-Term Debt	3,966	3,997
Other, noncurrent liabilities	258	228
Duke Energy Carolinas
Allowance for doubtful accounts - receivables	3	3
Regulatory Assets: Current	524	550
Current Assets: Other	31	21
Other Noncurrent Assets: Regulatory assets	3,427	3,360
Other, noncurrent assets	1,136	1,149
Current maturities of long-term debt	457	458
Long-Term Debt	12,050	11,142
Other, noncurrent liabilities	640	627
Duke Energy Carolinas | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	8	7
Progress Energy
Allowance for doubtful accounts - receivables	8	7
Regulatory Assets: Current	954	946
Current Assets: Other	196	210
Other Noncurrent Assets: Regulatory assets	6,489	6,346
Other, noncurrent assets	1,121	1,049
Current maturities of long-term debt	1,828	1,577
Long-Term Debt	$ 17,377	$ 17,907
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100	100
Common stock, shares outstanding	100	100
Other, noncurrent liabilities	$ 404	$ 383
Progress Energy | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	12	9
Regulatory Assets: Current	53	52
Current Assets: Other	13	39
Other Noncurrent Assets: Regulatory assets	980	989
Current maturities of long-term debt	54	54
Long-Term Debt	1,603	1,632
Duke Energy Progress
Allowance for doubtful accounts - receivables	2	3
Regulatory Assets: Current	503	526
Current Assets: Other	48	60
Other Noncurrent Assets: Regulatory assets	4,392	4,152
Other, noncurrent assets	682	651
Current maturities of long-term debt	1,006	1,006
Long-Term Debt	7,903	7,902
Other, noncurrent liabilities	83	92
Duke Energy Progress | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	7	5
Duke Energy Florida
Allowance for doubtful accounts - receivables	6	3
Regulatory Assets: Current	451	419
Current Assets: Other	37	58
Other Noncurrent Assets: Regulatory assets	2,097	2,194
Other, noncurrent assets	329	311
Current maturities of long-term debt	322	571
Long-Term Debt	7,384	7,416
Other, noncurrent liabilities	169	136
Duke Energy Florida | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	5	4
Regulatory Assets: Current	53	52
Current Assets: Other	13	39
Other Noncurrent Assets: Regulatory assets	980	989
Current maturities of long-term debt	54	54
Long-Term Debt	1,278	1,307
Duke Energy Ohio
Allowance for doubtful accounts - receivables	5	4
Regulatory Assets: Current	33	49
Current Assets: Other	11	21
Other Noncurrent Assets: Regulatory assets	567	549
Other, noncurrent assets	56	52
Long-Term Debt	$ 2,595	$ 2,594
Common stock, par value (in usd per share)	$ 8.50	$ 8.50
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares outstanding	90,000,000	90,000,000
Other, noncurrent liabilities	$ 97	$ 94
Duke Energy Indiana
Allowance for doubtful accounts - receivables	3	3
Regulatory Assets: Current	78	90
Current Assets: Other	36	60
Other Noncurrent Assets: Regulatory assets	1,098	1,082
Other, noncurrent assets	214	234
Current maturities of long-term debt	503	503
Long-Term Debt	3,950	3,404
Other, noncurrent liabilities	30	18
Piedmont Natural Gas
Allowance for doubtful accounts - receivables	5	2
Regulatory Assets: Current	96	73
Current Assets: Other	13	28
Other Noncurrent Assets: Regulatory assets	263	290
Other, noncurrent assets	132	121
Long-Term Debt	$ 2,385	$ 2,384
Common stock, shares authorized	100	100
Common stock, shares outstanding	100	100
Other, noncurrent liabilities	$ 121	$ 148
Preferred stock, Series A
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized	40,000,000	40,000,000
Preferred stock, depositary shares outstanding	40,000,000	40,000,000
Preferred stock, Series B
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized	1,000,000	1,000,000
Preferred stock, depositary shares outstanding	1,000,000	1,000,000