Employee Benefit Plans (Fair Value Measurements of Plan Assets - Master Retirement Trust) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 6,969	$ 7,241
OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 20	$ 20
Duke Energy Carolinas | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	27.00%	27.00%
Progress Energy | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	33.00%	33.00%
Duke Energy Progress | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	15.00%	15.00%
Duke Energy Florida | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	18.00%	18.00%
Duke Energy Ohio | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	5.00%	5.00%
Duke Energy Indiana | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	7.00%	7.00%
Piedmont | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	3.00%	3.00%
Equity securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 2,461	$ 2,221
Equity securities | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	10	9
Corporate debt securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,415	2,807
Short-term investment funds | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	310	233
Partnership interests | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	68	76
Hedge funds | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	164	164
Real estate | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	1	1
U.S. government bonds | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	1,398	1,571
Governments bonds – foreign | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	128	107
Cash | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	15	7
Government and commercial mortgage-backed securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	1	1
Net pending transactions and other investments | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	9	54
Cash and cash equivalents | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	3	4
Debt securities | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	6	6
Level 1 | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,242	2,042
Level 1 | Equity securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,216	1,995
Level 1 | Cash | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	15	7
Level 1 | Net pending transactions and other investments | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	11	40
Level 2 | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	4,481	4,944
Level 2 | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	20	20
Level 2 | Equity securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	231	211
Level 2 | Equity securities | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	10	9
Level 2 | Corporate debt securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,415	2,807
Level 2 | Short-term investment funds | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	310	233
Level 2 | Real estate | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	1	1
Level 2 | U.S. government bonds | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	1,398	1,571
Level 2 | Governments bonds – foreign | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	128	107
Level 2 | Government and commercial mortgage-backed securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	1	1
Level 2 | Net pending transactions and other investments | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	(2)	14
Level 2 | Cash and cash equivalents | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	3	4
Level 2 | Debt securities | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	6	6
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total assets	68	76	$ 62
Level 3 | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	68	76
Level 3 | Partnership interests | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	68	76
Not Categorized | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	178	179
Not Categorized | Equity securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	14	15
Not Categorized | Hedge funds | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 164	$ 164