Summary of Significant Accounting Policies (Accounts Payable and Supplier Invoices Sold) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Payables [Line Items]
Outstanding Accounts Payable Balance Sold	$ 87	$ 19
Suppliers Invoices Settled Through The Program	301	122
Duke Energy Carolinas
Payables [Line Items]
Outstanding Accounts Payable Balance Sold	6
Suppliers Invoices Settled Through The Program	29
Progress Energy
Payables [Line Items]
Outstanding Accounts Payable Balance Sold	19	9
Suppliers Invoices Settled Through The Program	85	10
Duke Energy Progress
Payables [Line Items]
Outstanding Accounts Payable Balance Sold	8
Suppliers Invoices Settled Through The Program	26
Duke Energy Florida
Payables [Line Items]
Outstanding Accounts Payable Balance Sold	11	9
Suppliers Invoices Settled Through The Program	59	10
Duke Energy Ohio
Payables [Line Items]
Outstanding Accounts Payable Balance Sold	5	6
Suppliers Invoices Settled Through The Program	38	12
Duke Energy Indiana
Payables [Line Items]
Suppliers Invoices Settled Through The Program	2
Piedmont
Payables [Line Items]
Outstanding Accounts Payable Balance Sold	57	4
Suppliers Invoices Settled Through The Program	$ 147	$ 100