Asset Retirement Obligations (ARO by Category) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Asset Retirement Obligations [Line Items]
Total ARO	$ 12,233	$ 12,728
Less: Current portion	620	773
Total noncurrent ARO	11,613	11,955
Duke Energy Carolinas
Asset Retirement Obligations [Line Items]
Total ARO	5,268	5,382
Less: Current portion	238	261
Total noncurrent ARO	5,030	5,121
Progress Energy
Asset Retirement Obligations [Line Items]
Total ARO	5,930	6,181
Less: Current portion	261	289
Total noncurrent ARO	5,669	5,892
Duke Energy Progress
Asset Retirement Obligations [Line Items]
Total ARO	5,622	5,823
Less: Current portion	260	288
Total noncurrent ARO	5,362	5,535
Duke Energy Florida
Asset Retirement Obligations [Line Items]
Total ARO	308	358
Less: Current portion	1	1
Total noncurrent ARO	307	357
Duke Energy Ohio
Asset Retirement Obligations [Line Items]
Total ARO	138	154
Less: Current portion	8	17
Total noncurrent ARO	130	137
Duke Energy Indiana
Asset Retirement Obligations [Line Items]
Total ARO	842	951
Less: Current portion	114	207
Total noncurrent ARO	728	744
Piedmont
Asset Retirement Obligations [Line Items]
Total ARO	28	26
Total noncurrent ARO	28	$ 26
Decommissioning of nuclear power facilities
Asset Retirement Obligations [Line Items]
Total ARO	7,459
Decommissioning of nuclear power facilities | Duke Energy Carolinas
Asset Retirement Obligations [Line Items]
Total ARO	3,136
Decommissioning of nuclear power facilities | Progress Energy
Asset Retirement Obligations [Line Items]
Total ARO	4,295
Decommissioning of nuclear power facilities | Duke Energy Progress
Asset Retirement Obligations [Line Items]
Total ARO	4,069
Decommissioning of nuclear power facilities | Duke Energy Florida
Asset Retirement Obligations [Line Items]
Total ARO	226
Closure of ash impoundments
Asset Retirement Obligations [Line Items]
Total ARO	4,474
Closure of ash impoundments | Duke Energy Carolinas
Asset Retirement Obligations [Line Items]
Total ARO	2,065
Closure of ash impoundments | Progress Energy
Asset Retirement Obligations [Line Items]
Total ARO	1,530
Closure of ash impoundments | Duke Energy Progress
Asset Retirement Obligations [Line Items]
Total ARO	1,509
Closure of ash impoundments | Duke Energy Florida
Asset Retirement Obligations [Line Items]
Total ARO	21
Closure of ash impoundments | Duke Energy Ohio
Asset Retirement Obligations [Line Items]
Total ARO	77
Closure of ash impoundments | Duke Energy Indiana
Asset Retirement Obligations [Line Items]
Total ARO	801
Other
Asset Retirement Obligations [Line Items]
Total ARO	300
Other | Duke Energy Carolinas
Asset Retirement Obligations [Line Items]
Total ARO	67
Other | Progress Energy
Asset Retirement Obligations [Line Items]
Total ARO	105
Other | Duke Energy Progress
Asset Retirement Obligations [Line Items]
Total ARO	44
Other | Duke Energy Florida
Asset Retirement Obligations [Line Items]
Total ARO	61
Other | Duke Energy Ohio
Asset Retirement Obligations [Line Items]
Total ARO	61
Other | Duke Energy Indiana
Asset Retirement Obligations [Line Items]
Total ARO	41
Other | Piedmont
Asset Retirement Obligations [Line Items]
Total ARO	$ 28