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Debt and Credit Facilities (Annual Maturities) (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Current Maturities Of Long Term Debt [Abstract] |  |
Current maturities of long-term debt | $ 3,406,000,000 | $ 3,244,000,000
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
2019 | 3,408,000,000 |
2020 | 3,765,000,000 |
2021 | 4,803,000,000 |
2022 | 2,745,000,000 |
2023 | 3,375,000,000 |
Thereafter | 35,288,000,000 |
Total long-term debt, including current maturities | 53,384,000,000 |
Purchase accounting adjustments | 1,600,000,000 | 1,700,000,000
Other Debt Obligations [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Current maturities of long-term debt | 606,000,000 |
Purchase Accounting Adjustments [Member] |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
Purchase accounting adjustments | $ (1,578,000,000) |
Parent Company [Member] | Debt Maturing September 2019, 5.050% Coupon [Member] | Unsecured Debt [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Interest rate | 5.05% |
Current maturities of long-term debt | $ 500,000,000 |
Duke Energy Carolinas [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Current maturities of long-term debt | 6,000,000 | 1,205,000,000
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
2019 | 6,000,000 |
2020 | 907,000,000 |
2021 | 503,000,000 |
2022 | 353,000,000 |
2023 | 1,303,000,000 |
Thereafter | 7,940,000,000 |
Total long-term debt, including current maturities | 11,012,000,000 |
Progress Energy [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Current maturities of long-term debt | 1,672,000,000 | 771,000,000
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
2019 | 1,674,000,000 |
2020 | 926,000,000 |
2021 | 2,004,000,000 |
2022 | 1,032,000,000 |
2023 | 535,000,000 |
Thereafter | 12,880,000,000 |
Total long-term debt, including current maturities | $ 19,051,000,000 |
Progress Energy [Member] | Debt Maturing March 2019, 7.050% Coupon [Member] | Unsecured Debt [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Interest rate | 7.05% |
Current maturities of long-term debt | $ 450,000,000 |
Duke Energy Progress [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Current maturities of long-term debt | 603,000,000 | 3,000,000
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
2019 | 603,000,000 |
2020 | 354,000,000 |
2021 | 904,000,000 |
2022 | 505,000,000 |
2023 | 456,000,000 |
Thereafter | 5,437,000,000 |
Total long-term debt, including current maturities | $ 8,259,000,000 |
Duke Energy Progress [Member] | Bonds Maturing January 2019, 5.300% Coupon [Member] | First Mortgage Bonds [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Interest rate | 5.30% |
Current maturities of long-term debt | $ 600,000,000 |
Duke Energy Florida [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Current maturities of long-term debt | 270,000,000 | 768,000,000
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
2019 | 270,000,000 |
2020 | 572,000,000 |
2021 | 600,000,000 |
2022 | 77,000,000 |
2023 | 79,000,000 |
Thereafter | 5,793,000,000 |
Total long-term debt, including current maturities | 7,391,000,000 |
Duke Energy Ohio [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Current maturities of long-term debt | 551,000,000 | 3,000,000
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
2019 | 552,000,000 |
2020 | 0 |
2021 | 50,000,000 |
2022 | 0 |
2023 | 350,000,000 |
Thereafter | 1,251,000,000 |
Total long-term debt, including current maturities | $ 2,203,000,000 |
Duke Energy Ohio [Member] | Bonds Maturing April 2019, 5.450% Coupon [Member] [Member] | First Mortgage Bonds [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Interest rate | 5.45% |
Current maturities of long-term debt | $ 450,000,000 |
Duke Energy Indiana [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Current maturities of long-term debt | 63,000,000 | 3,000,000
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
2019 | 63,000,000 |
2020 | 503,000,000 |
2021 | 70,000,000 |
2022 | 94,000,000 |
2023 | 153,000,000 |
Thereafter | 2,925,000,000 |
Total long-term debt, including current maturities | 3,808,000,000 |
Piedmont Natural Gas [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Current maturities of long-term debt | 350,000,000 | $ 250,000,000
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
2019 | 350,000,000 |
2020 | 0 |
2021 | 160,000,000 |
2022 | 0 |
2023 | 45,000,000 |
Thereafter | 1,595,000,000 |
Total long-term debt, including current maturities | $ 2,150,000,000 |
Piedmont Natural Gas [Member] | Debt Maturing September 2019, 3.155% Coupon [Member] | Unsecured Debt [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Interest rate | 3.155% |
Current maturities of long-term debt | $ 350,000,000 |
Piedmont Natural Gas [Member] | Debt Maturing December 2019, 4.875% Coupon [Member] | Unsecured Debt [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Interest rate | 4.875% |
Current maturities of long-term debt | $ 350,000,000 |
Duke Energy Kentucky [Member] | Debt Maturing October 2019, 4.65% Coupon [Member] | Unsecured Debt [Member] |  |
Current Maturities Of Long Term Debt [Abstract] |  |
Interest rate | 4.65% |
Current maturities of long-term debt | $ 100,000,000 |

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