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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Jun. 30, 2019 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | $ 365
Due after one through five years | 527
Due after five through 10 years | 499
Due after 10 years | 1,186
Total | 2,577
Duke Energy Carolinas [Member] |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 43
Due after one through five years | 213
Due after five through 10 years | 242
Due after 10 years | 622
Total | 1,120
Progress Energy [Member] |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 315
Due after one through five years | 265
Due after five through 10 years | 203
Due after 10 years | 458
Total | 1,241
Duke Energy Progress [Member] |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 29
Due after one through five years | 257
Due after five through 10 years | 192
Due after 10 years | 428
Total | 906
Duke Energy Florida [Member] |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 286
Due after one through five years | 8
Due after five through 10 years | 11
Due after 10 years | 30
Total | 335
Duke Energy Indiana [Member] |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 4
Due after one through five years | 15
Due after five through 10 years | 4
Due after 10 years | 19
Total | $ 42

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