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Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Current Assets |  |
Cash and cash equivalents | $ 253 | $ 409
Other | 76 | 82
Other Noncurrent Assets |  |
Other | 16 | 11
Total cash, cash equivalents and restricted cash | 345 | 502
Duke Energy Carolinas |  |
Current Assets |  |
Cash and cash equivalents | 9 | 44
Other | 9 | 8
Other Noncurrent Assets |  |
Other | 1 | 1
Total cash, cash equivalents and restricted cash | 19 | 53
Progress Energy |  |
Current Assets |  |
Cash and cash equivalents | 59 | 108
Other | 67 | 74
Other Noncurrent Assets |  |
Other | 9 | 2
Total cash, cash equivalents and restricted cash | 135 | 184
Duke Energy Progress |  |
Current Assets |  |
Cash and cash equivalents | 18 | 49
Other | 31 | 28
Other Noncurrent Assets |  |
Other | 2 | 2
Total cash, cash equivalents and restricted cash | 51 | 79
Duke Energy Florida |  |
Current Assets |  |
Cash and cash equivalents | 24 | 45
Other | 36 | 41
Other Noncurrent Assets |  |
Other | 7 |
Total cash, cash equivalents and restricted cash | $ 67 | $ 86

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