Employee Benefit Plans (Fair Value Measurements of Plan Assets - Master Retirement Trust) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 62	$ 95
Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	7,073	9,352
Master Trust | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,065	2,975
Master Trust | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	4,711	6,038
Master Trust | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total assets	62	95
Master Trust | Not Categorized
Defined Benefit Plan Disclosure [Line Items]
Total assets	235	244
Master Trust | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,234	2,575
Master Trust | Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,014	2,547
Master Trust | Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	194
Master Trust | Equity securities | Not Categorized
Defined Benefit Plan Disclosure [Line Items]
Total assets	26	28
Master Trust | Corporate debt securities
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,944	4,189
Master Trust | Corporate debt securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,944	4,189
Master Trust | Short-term investment funds
Defined Benefit Plan Disclosure [Line Items]
Total assets	193	382
Master Trust | Short-term investment funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets	1	272
Master Trust | Short-term investment funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	192	110
Master Trust | Partnership interests
Defined Benefit Plan Disclosure [Line Items]
Total assets	62	95
Master Trust | Partnership interests | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total assets	62	95
Master Trust | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Total assets	209	216
Master Trust | Hedge funds | Not Categorized
Defined Benefit Plan Disclosure [Line Items]
Total assets	209	216
Master Trust | U.S. government bonds
Defined Benefit Plan Disclosure [Line Items]
Total assets	1,254	1,618
Master Trust | U.S. government bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	1,254	1,618
Master Trust | Governments bonds – foreign
Defined Benefit Plan Disclosure [Line Items]
Total assets	112	78
Master Trust | Governments bonds – foreign | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	112	78
Master Trust | Cash
Defined Benefit Plan Disclosure [Line Items]
Total assets	45	144
Master Trust | Cash | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets	45	144
Master Trust | Government and commercial mortgage backed securities
Defined Benefit Plan Disclosure [Line Items]
Total assets	6	2
Master Trust | Government and commercial mortgage backed securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	6	2
Master Trust | Net pending transactions and other investments
Defined Benefit Plan Disclosure [Line Items]
Total assets	14	53
Master Trust | Net pending transactions and other investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets	5	12
Master Trust | Net pending transactions and other investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	9	41
OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	33	45
OPEB | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	33	45
OPEB | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total assets	12	18
OPEB | Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	12	18
OPEB | Real estate
Defined Benefit Plan Disclosure [Line Items]
Total assets	2	2
OPEB | Real estate | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	2	2
OPEB | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total assets	11	14
OPEB | Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	11	14
OPEB | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Total assets	8	11
OPEB | Debt securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 8	$ 11
Duke Energy Carolinas | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	27.00%	26.00%
Progress Energy | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	33.00%	32.00%
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%	17.00%
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%	4.00%