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Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 2,000,000,000 |
Repayments of long-term debt |  | 1,201,000,000 | $ 487,000,000
Parent Company [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 600,000,000 |
Duke Energy Carolinas [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of long-term debt |  | 1,000,000 | 401,000,000
Duke Energy Progress [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 600,000,000 |
Repayments of long-term debt |  | 601,000,000 |
Duke Energy Florida [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of long-term debt |  | 81,000,000 | $ 80,000,000
Duke Energy Ohio [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 800,000,000 |
Duke Energy Ohio [Member] | April 2019 First Mortgage Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of long-term debt | $ 450,000,000 |  |
Unsecured Debt [Member] | March 2019 Debt Issuance 3.250% Coupon Due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 300,000,000 |
Interest rate |  | 3.25075% |
Unsecured Debt [Member] | March 2019 Debt Issuance 3.227% Coupon Due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 300,000,000 |
Interest rate |  | 3.227% |
Unsecured Debt [Member] | Parent Company [Member] | March 2019 Debt Issuance 3.250% Coupon Due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 300,000,000 |
Unsecured Debt [Member] | Parent Company [Member] | March 2019 Debt Issuance 3.227% Coupon Due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 300,000,000 |
First Mortgage [Member] | January 2019 Debt Issuance 3.650% Coupon Due 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 400,000,000 |
Interest rate |  | 3.65% |
First Mortgage [Member] | January 2019 Debt Issuance 4.300% Coupon Due 2049 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 400,000,000 |
Interest rate |  | 4.30% |
First Mortgage [Member] | March 2019 Debt Issuance 3.450% Coupon Due 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 600,000,000 |
Interest rate |  | 3.45% |
First Mortgage [Member] | Duke Energy Progress [Member] | March 2019 Debt Issuance 3.450% Coupon Due 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 600,000,000 |
First Mortgage [Member] | Duke Energy Ohio [Member] | January 2019 Debt Issuance 3.650% Coupon Due 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 400,000,000 |
First Mortgage [Member] | Duke Energy Ohio [Member] | January 2019 Debt Issuance 4.300% Coupon Due 2049 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 400,000,000 |

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