Asset Retirement Obligations (ARO by Category) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Asset Retirement Obligations [Line Items]
Total ARO	$ 12,950	$ 12,776
Less: Current portion	798	647
Total noncurrent ARO	12,152	12,129
Duke Energy Carolinas
Asset Retirement Obligations [Line Items]
Total ARO	5,393	5,301
Less: Current portion	278	249
Total noncurrent ARO	5,115	5,052
Progress Energy
Asset Retirement Obligations [Line Items]
Total ARO	6,203	6,112
Less: Current portion	311	275
Total noncurrent ARO	5,892	5,837
Duke Energy Progress
Asset Retirement Obligations [Line Items]
Total ARO	5,839	5,675
Less: Current portion	310	274
Total noncurrent ARO	5,529	5,401
Duke Energy Florida
Asset Retirement Obligations [Line Items]
Total ARO	364	437
Less: Current portion	1	1
Total noncurrent ARO	363	436
Duke Energy Ohio
Asset Retirement Obligations [Line Items]
Total ARO	155	136
Less: Current portion	23	13
Total noncurrent ARO	132	123
Duke Energy Indiana
Asset Retirement Obligations [Line Items]
Total ARO	958	987
Less: Current portion	185	110
Total noncurrent ARO	773	877
Piedmont
Asset Retirement Obligations [Line Items]
Total ARO	23	22
Total noncurrent ARO	23	$ 22
Decommissioning of nuclear power facilities
Asset Retirement Obligations [Line Items]
Total ARO	7,206
Decommissioning of nuclear power facilities | Duke Energy Carolinas
Asset Retirement Obligations [Line Items]
Total ARO	2,968
Decommissioning of nuclear power facilities | Progress Energy
Asset Retirement Obligations [Line Items]
Total ARO	4,202
Decommissioning of nuclear power facilities | Duke Energy Progress
Asset Retirement Obligations [Line Items]
Total ARO	3,908
Decommissioning of nuclear power facilities | Duke Energy Florida
Asset Retirement Obligations [Line Items]
Total ARO	294
Closure of ash impoundments
Asset Retirement Obligations [Line Items]
Total ARO	5,293
Closure of ash impoundments | Duke Energy Carolinas
Asset Retirement Obligations [Line Items]
Total ARO	2,360
Closure of ash impoundments | Progress Energy
Asset Retirement Obligations [Line Items]
Total ARO	1,914
Closure of ash impoundments | Duke Energy Progress
Asset Retirement Obligations [Line Items]
Total ARO	1,885
Closure of ash impoundments | Duke Energy Florida
Asset Retirement Obligations [Line Items]
Total ARO	29
Closure of ash impoundments | Duke Energy Ohio
Asset Retirement Obligations [Line Items]
Total ARO	99
Closure of ash impoundments | Duke Energy Indiana
Asset Retirement Obligations [Line Items]
Total ARO	919
Other
Asset Retirement Obligations [Line Items]
Total ARO	451
Other | Duke Energy Carolinas
Asset Retirement Obligations [Line Items]
Total ARO	65
Other | Progress Energy
Asset Retirement Obligations [Line Items]
Total ARO	87
Other | Duke Energy Progress
Asset Retirement Obligations [Line Items]
Total ARO	46
Other | Duke Energy Florida
Asset Retirement Obligations [Line Items]
Total ARO	41
Other | Duke Energy Ohio
Asset Retirement Obligations [Line Items]
Total ARO	56
Other | Duke Energy Indiana
Asset Retirement Obligations [Line Items]
Total ARO	39
Other | Piedmont
Asset Retirement Obligations [Line Items]
Total ARO	$ 23