Fair Value Measurements (Other Fair Value Disclosures) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	$ 71,215	$ 63,835
Long-term debt, fair value	63,454	69,683
Unamortized debt discount and premium, net	1,170	1,250
Duke Energy Carolinas
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	14,266	13,275
Long-term debt, fair value	12,943	15,101
Progress Energy
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	22,439	20,823
Long-term debt, fair value	20,467	23,751
Duke Energy Progress
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	11,087	10,249
Long-term debt, fair value	9,689	11,252
Duke Energy Florida
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	9,709	8,482
Long-term debt, fair value	8,991	9,772
Duke Energy Ohio
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	3,245	3,193
Long-term debt, fair value	2,927	3,570
Duke Energy Indiana
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	4,307	4,323
Long-term debt, fair value	3,913	5,067
Piedmont
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	3,363	2,968
Long-term debt, fair value	$ 2,940	$ 3,278