Asset Retirement Obligations (Recorded on the Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	$ 12,776	$ 13,004	$ 13,318
Less: Current portion	647	718
Total noncurrent asset retirement obligation	12,129	12,286
Decommissioning of nuclear power facilities
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	7,046
Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	5,293
Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	437
Duke Energy Carolinas
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	5,301	5,350	5,734
Less: Current portion	249	264
Total noncurrent asset retirement obligation	5,052	5,086
Duke Energy Carolinas | Decommissioning of nuclear power facilities
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	2,847
Duke Energy Carolinas | Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	2,390
Duke Energy Carolinas | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	64
Progress Energy
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	6,112	6,149	6,471
Less: Current portion	275	283
Total noncurrent asset retirement obligation	5,837	5,866
Progress Energy | Decommissioning of nuclear power facilities
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	4,156
Progress Energy | Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	1,872
Progress Energy | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	84
Duke Energy Progress
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	5,675	5,635	5,893
Less: Current portion	274	283
Total noncurrent asset retirement obligation	5,401	5,352
Duke Energy Progress | Decommissioning of nuclear power facilities
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	3,792
Duke Energy Progress | Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	1,839
Duke Energy Progress | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	44
Duke Energy Florida
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	437	514	578
Less: Current portion	1
Total noncurrent asset retirement obligation	436	514
Duke Energy Florida | Decommissioning of nuclear power facilities
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	364
Duke Energy Florida | Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	33
Duke Energy Florida | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	40
Duke Energy Ohio
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	136	111	80
Less: Current portion	13	3
Total noncurrent asset retirement obligation	123	108
Duke Energy Ohio | Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	82
Duke Energy Ohio | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	54
Duke Energy Indiana
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	987	1,176	832
Less: Current portion	110	168
Total noncurrent asset retirement obligation	877	1,008
Duke Energy Indiana | Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	949
Duke Energy Indiana | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	38
Piedmont
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	22	20	$ 17
Total noncurrent asset retirement obligation	22	$ 20
Piedmont | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	$ 22