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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | $ 98
Due after one through five years | 501
Due after five through ten years | 570
Due after ten years | 1,222
Total | 2,391
Duke Energy Carolinas [Member] |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 6
Due after one through five years | 142
Due after five through ten years | 303
Due after ten years | 589
Total | 1,040
Progress Energy [Member] |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 87
Due after one through five years | 306
Due after five through ten years | 216
Due after ten years | 541
Total | 1,150
Duke Energy Progress [Member] |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 49
Due after one through five years | 231
Due after five through ten years | 161
Due after ten years | 419
Total | 860
Duke Energy Florida [Member] |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 38
Due after one through five years | 75
Due after five through ten years | 55
Due after ten years | 122
Total | 290
Duke Energy Indiana [Member] |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 3
Due after one through five years | 20
Due after five through ten years | 4
Due after ten years | 14
Total | $ 41

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