Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Allowance for doubtful accounts - receivables	$ 23	$ 22
Regulatory Assets: Current	1,774	1,796
Current Assets: Other	1,031	764
Other Noncurrent Assets: Regulatory assets	13,285	13,222
Other, noncurrent assets	3,458	3,289
Current maturities of long-term debt	3,756	3,141
Long-Term Debt	$ 56,143	$ 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	$ 1,563	$ 1,581
Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	79	54
Regulatory Assets: Current	53	52
Current Assets: Other	260	242
Other Noncurrent Assets: Regulatory assets	969	989
Other, noncurrent assets	85	110
Current maturities of long-term debt	462	216
Long-Term Debt	3,643	3,997
Other, noncurrent liabilities	251	228
Duke Energy Carolinas
Allowance for doubtful accounts - receivables	1	3
Regulatory Assets: Current	490	550
Current Assets: Other	19	21
Other Noncurrent Assets: Regulatory assets	3,440	3,360
Other, noncurrent assets	1,158	1,149
Current maturities of long-term debt	508	458
Long-Term Debt	11,713	11,142
Other, noncurrent liabilities	611	627
Duke Energy Carolinas | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	13	7
Progress Energy
Allowance for doubtful accounts - receivables	9	7
Regulatory Assets: Current	957	946
Current Assets: Other	145	210
Other Noncurrent Assets: Regulatory assets	6,308	6,346
Other, noncurrent assets	1,164	1,049
Current maturities of long-term debt	1,829	1,577
Long-Term Debt	$ 17,625	$ 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	$ 449	$ 383
Progress Energy | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	20	9
Regulatory Assets: Current	53	52
Current Assets: Other	32	39
Other Noncurrent Assets: Regulatory assets	969	989
Current maturities of long-term debt	304	54
Long-Term Debt	1,361	1,632
Duke Energy Progress
Allowance for doubtful accounts - receivables	4	3
Regulatory Assets: Current	526	526
Current Assets: Other	37	60
Other Noncurrent Assets: Regulatory assets	4,448	4,152
Other, noncurrent assets	688	651
Current maturities of long-term debt	1,006	1,006
Long-Term Debt	7,907	7,902
Other, noncurrent liabilities	105	92
Duke Energy Progress | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	10	5
Duke Energy Florida
Allowance for doubtful accounts - receivables	5	3
Regulatory Assets: Current	432	419
Current Assets: Other	44	58
Other Noncurrent Assets: Regulatory assets	1,860	2,194
Other, noncurrent assets	327	311
Current maturities of long-term debt	323	571
Long-Term Debt	7,628	7,416
Other, noncurrent liabilities	194	136
Duke Energy Florida | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	9	4
Regulatory Assets: Current	53	52
Current Assets: Other	32	39
Other Noncurrent Assets: Regulatory assets	969	989
Current maturities of long-term debt	304	54
Long-Term Debt	1,028	1,307
Duke Energy Ohio
Allowance for doubtful accounts - receivables	5	4
Regulatory Assets: Current	32	49
Current Assets: Other	14	21
Other Noncurrent Assets: Regulatory assets	593	549
Other, noncurrent assets	59	52
Long-Term Debt	$ 2,994	$ 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	$ 96	$ 94
Duke Energy Indiana
Allowance for doubtful accounts - receivables	3	3
Regulatory Assets: Current	90	90
Current Assets: Other	45	60
Other Noncurrent Assets: Regulatory assets	1,113	1,082
Other, noncurrent assets	251	234
Current maturities of long-term debt	503	503
Long-Term Debt	3,950	3,404
Other, noncurrent liabilities	12	18
Piedmont Natural Gas
Allowance for doubtful accounts - receivables	6	6
Regulatory Assets: Current	118	73
Current Assets: Other	54	28
Other Noncurrent Assets: Regulatory assets	280	290
Other, noncurrent assets	278	121
Current maturities of long-term debt	160
Long-Term Debt	$ 2,619	$ 2,384
Common stock, shares authorized	100	100
Common stock, shares outstanding	100	100
Other, noncurrent liabilities	$ 141	$ 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