Fair Value Measurements (Other Fair Value Disclosures) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Book Value	$ 75,252	$ 69,751
Fair Value	69,790	61,986
Unamortized debt discount and premium, net	1,000	1,200
Duke Energy Carolinas
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Book Value	16,012	14,266
Fair Value	15,077	12,943
Progress Energy
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Book Value	23,759	22,439
Fair Value	22,553	20,467
Duke Energy Progress
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Book Value	11,714	11,087
Fair Value	10,595	9,689
Duke Energy Florida
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Book Value	10,401	9,709
Fair Value	10,123	8,991
Duke Energy Ohio
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Book Value	3,518	3,245
Fair Value	3,310	2,927
Duke Energy Indiana
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Book Value	4,502	4,307
Fair Value	4,230	3,913
Piedmont
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Book Value	3,668	3,363
Fair Value	$ 3,336	$ 2,940