Employee Benefit Plans (Fair Value Measurements of Plan Assets - Master Retirement Trust) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 7,241	$ 7,073
OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 20	$ 33
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	$ 2,221	$ 2,234
Equity securities | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	9	12
Corporate debt securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,807	2,944
Short-term investment funds | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	233	193
Partnership interests | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	76	62
Hedge funds | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	164	209
Real estate | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	1	2
U.S. government bonds | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	1,571	1,254
Governments bonds – foreign | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	107	112
Cash | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	7	45
Government and commercial mortgage-backed securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	1	6
Net pending transactions and other investments | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	54	14
Cash and cash equivalents | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	4	11
Debt securities | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	6	8
Level 1 | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,042	2,065
Level 1 | Equity securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	1,995	2,014
Level 1 | Short-term investment funds | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets		1
Level 1 | Cash | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	7	45
Level 1 | Net pending transactions and other investments | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	40	5
Level 2 | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	4,944	4,711
Level 2 | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	20	33
Level 2 | Equity securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	211	194
Level 2 | Equity securities | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	9	12
Level 2 | Corporate debt securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,807	2,944
Level 2 | Short-term investment funds | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	233	192
Level 2 | Real estate | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	1	2
Level 2 | U.S. government bonds | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	1,571	1,254
Level 2 | Governments bonds – foreign | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	107	112
Level 2 | Government and commercial mortgage-backed securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	1	6
Level 2 | Net pending transactions and other investments | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	14	9
Level 2 | Cash and cash equivalents | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	4	11
Level 2 | Debt securities | OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	6	8
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total assets	76	62	$ 95
Level 3 | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	76	62
Level 3 | Partnership interests | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	76	62
Not Categorized | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	179	235
Not Categorized | Equity securities | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	15	26
Not Categorized | Hedge funds | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 164	$ 209