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Summary of Significant Accounting Policies (Accounts Payable and Supplier Invoices Sold) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Payables [Line Items] |  |
Outstanding Accounts Payable Balance Sold | $ 19 | $ 15
Suppliers Invoices Settled Through The Program | 122 | 45
Progress Energy |  |
Payables [Line Items] |  |
Outstanding Accounts Payable Balance Sold | 9 |
Suppliers Invoices Settled Through The Program | 10 |
Duke Energy Florida |  |
Payables [Line Items] |  |
Outstanding Accounts Payable Balance Sold | 9 |
Suppliers Invoices Settled Through The Program | 10 |
Duke Energy Ohio |  |
Payables [Line Items] |  |
Outstanding Accounts Payable Balance Sold | 6 | 1
Suppliers Invoices Settled Through The Program | 12 | 9
Piedmont |  |
Payables [Line Items] |  |
Outstanding Accounts Payable Balance Sold | 4 | 14
Suppliers Invoices Settled Through The Program | $ 100 | $ 36

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