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Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Debt issuances | $ 5,050,000,000 | $ 6,070,000,000
January 2017 Issuance Maturing January 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 3.20%
January 2017 Issuance Maturing January 2027 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 650,000,000
April 2017 Issuance Maturing April 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 3.364%
April 2017 Issuance Maturing April 2025 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 420,000,000
June 2017 Issuance Maturing June 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 2.10%
June 2017 Issuance Maturing June 2020 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 330,000,000
August 2017 Issuance Maturing August 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 2.40%
August 2017 Issuance Maturing August 2022 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 500,000,000
August 2017 Issuance Maturing August 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 3.15%
August 2017 Issuance Maturing August 2027 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 750,000,000
August 2017 Issuance Maturing August 2047 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 3.95%
August 2017 Issuance Maturing August 2047 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 500,000,000
December 2017 Issuance Maturing December 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 2.10%
December 2017 Issuance Maturing December 2019 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 400,000,000
February 2017 Issuance Maturing June 2034 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 4.12%
February 2017 Issuance Maturing June 2034 [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 587,000,000
March 2018 Debt Issuance 3.950% Coupon Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.95% |
March 2018 Debt Issuance 3.950% Coupon Due 2025 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 250,000,000 |
May 2018 Debt Issuance 2.819% Coupon Due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.114% |
May 2018 Debt Issuance 2.819% Coupon Due 2021 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 500,000,000 |
September 2018 Debt Issuance 5.625% Coupon Due 2078 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 5.625% |
September 2018 Debt Issuance 5.625% Coupon Due 2078 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 500,000,000 |
June 2018 Debt Issuance 4.20 Coupon Due 2048 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.20% |
June 2018 Debt Issuance 4.20 Coupon Due 2048 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 400,000,000 |
August 2018 Debt Issuance 3.375% Coupon Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.375% |
August 2018 Debt Issuance 3.375% Coupon Due 2023 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 300,000,000 |
August 2018 Debt Issuance 3.700% Coupon Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.70% |
August 2018 Debt Issuance 3.700% Coupon Due 2028 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 500,000,000 |
November 2018 Debt Issuance 3.350% Coupon Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.35% |
November 2018 Debt Issuance 3.350% Coupon Due 2022 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 350,000,000 |
August 2017 Issuance Maturing December 2036 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 4.11%
August 2017 Issuance Maturing December 2036 [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 233,000,000
March 2018 Debt Issuance 3.050% Coupon Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.05% |
March 2018 Debt Issuance 3.050% Coupon Due 2023 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 500,000,000 |
March 2018 Debt Issuance 3.950% Coupon Due 2048 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.95% |
March 2018 Debt Issuance 3.950% Coupon Due 2048 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 500,000,000 |
June 2018 Debt issuance 3.80% coupon Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.80% |
June 2018 Debt issuance 3.80% coupon Due 2028 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 600,000,000 |
January 2017 Issuance Maturing January 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 1.85%
January 2017 Issuance Maturing January 2020 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 250,000,000
March 2017 Issuance Maturing June 2046 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 3.70%
March 2017 Issuance Maturing June 2046 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 100,000,000
September 2017 Issuance Maturing September 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 1.50%
September 2017 Issuance Maturing September 2020 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 300,000,000
November 2017 Issuance Maturing December 2047 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 3.70%
November 2017 Issuance Maturing December 2047 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 550,000,000
November 2018 Debt Issuance 3.950% Coupon Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.95% |
November 2018 Debt Issuance 3.950% Coupon Due 2028 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 650,000,000 |
September 2017 Issuance Maturing September 2047 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 3.60%
September 2017 Issuance Maturing September 2047 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 500,000,000
Parent Company [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 1,250,000,000 | 2,500,000,000
Parent Company [Member] | April 2017 Issuance Maturing April 2025 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 420,000,000
Repayments of Debt |  | 400,000,000
Parent Company [Member] | June 2017 Issuance Maturing June 2020 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 330,000,000
Repayments of Debt |  | 700,000,000
Parent Company [Member] | August 2017 Issuance Maturing August 2022 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 500,000,000
Parent Company [Member] | August 2017 Issuance Maturing August 2027 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 750,000,000
Parent Company [Member] | August 2017 Issuance Maturing August 2047 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 500,000,000
Parent Company [Member] | March 2018 Debt Issuance 3.950% Coupon Due 2025 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 250,000,000 |
Parent Company [Member] | May 2018 Debt Issuance 2.819% Coupon Due 2021 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 500,000,000 |
Parent Company [Member] | September 2018 Debt Issuance 5.625% Coupon Due 2078 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 500,000,000 |
Duke Energy Carolinas [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 2,000,000,000 | 550,000,000
Duke Energy Carolinas [Member] | First Mortgage Bonds Maturing April 2018, 5.100% Coupon [Member] |  |
Debt Instrument [Line Items] |  |
Repayments of Debt | 300,000,000 |
Duke Energy Carolinas [Member] | November 2018 Debt Issuance 3.350% Coupon Due 2022 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 350,000,000 |
Duke Energy Carolinas [Member] | March 2018 Debt Issuance 3.050% Coupon Due 2023 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 500,000,000 |
Duke Energy Carolinas [Member] | March 2018 Debt Issuance 3.950% Coupon Due 2048 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 500,000,000 |
Duke Energy Carolinas [Member] | November 2017 Issuance Maturing December 2047 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 550,000,000
Repayments of Debt |  | 400,000,000
Duke Energy Carolinas [Member] | November 2018 Debt Issuance 3.950% Coupon Due 2028 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 650,000,000 |
Duke Energy Progress [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 800,000,000 | 800,000,000
Duke Energy Progress [Member] | August 2018 Debt Issuance 3.375% Coupon Due 2023 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 300,000,000 |
Duke Energy Progress [Member] | August 2018 Debt Issuance 3.700% Coupon Due 2028 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 500,000,000 |
Duke Energy Progress [Member] | September 2017 Issuance Maturing September 2020 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 300,000,000
Repayments of Debt |  | 200,000,000
Duke Energy Progress [Member] | September 2017 Issuance Maturing September 2047 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 500,000,000
Duke Energy Florida [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 1,000,000,000 | 1,300,000,000
Duke Energy Florida [Member] | January 2017 Issuance Maturing January 2027 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 650,000,000
Duke Energy Florida [Member] | December 2017 Issuance Maturing December 2019 [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 400,000,000
Duke Energy Florida [Member] | June 2018 Debt Issuance 4.20 Coupon Due 2048 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 400,000,000 |
Duke Energy Florida [Member] | June 2018 Debt issuance 3.80% coupon Due 2028 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 600,000,000 |
Duke Energy Florida [Member] | January 2017 Issuance Maturing January 2020 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 250,000,000
Repayments of Debt |  | 250,000,000
Duke Energy Ohio [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 100,000,000
Duke Energy Ohio [Member] | March 2017 Issuance Maturing June 2046 [Member] | First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 100,000,000

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