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Debt and Credit Facilities (Summary of Current Maturities of Long-term Debt) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Debt Instrument [Line Items] |  |
Current maturities of long-term debt | $ 2,501 | $ 3,406
Other debt obligations [Member] |  |
Debt Instrument [Line Items] |  |
Current maturities of long-term debt | $ 501 |
Parent Company [Member] | Unsecured Debt [Member] | Debt Maturing September 2019, 5.050% Coupon [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 5.05% |
Current maturities of long-term debt | $ 500 |
Piedmont Natural Gas [Member] |  |
Debt Instrument [Line Items] |  |
Current maturities of long-term debt | $ 350 | 350
Piedmont Natural Gas [Member] | Unsecured Debt [Member] | Debt Maturing September 2019, 3.181% Coupon [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.181% |
Current maturities of long-term debt | $ 350 |
Duke Energy Kentucky [Member] | Secured Debt [Member] | Debt Maturing October 2019, 4.650% Coupon [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.65% |
Current maturities of long-term debt | $ 100 |
Progress Energy [Member] |  |
Debt Instrument [Line Items] |  |
Current maturities of long-term debt | $ 825 | 1,672
Progress Energy [Member] | Secured Debt [Member] | Debt Maturing December 2019, 4.875% Coupon [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.875% |
Current maturities of long-term debt | $ 350 |
Duke Energy Ohio [Member] |  |
Debt Instrument [Line Items] |  |
Current maturities of long-term debt | $ 551 | 551
Duke Energy Ohio [Member] | First Mortgage Bonds [Member] | Bonds Maturing April 2019, 5.450% Coupon [Member] [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 5.45% |
Current maturities of long-term debt | $ 450 |
Duke Energy Florida [Member] |  |
Debt Instrument [Line Items] |  |
Current maturities of long-term debt | $ 470 | $ 270
Duke Energy Florida [Member] | First Mortgage Bonds [Member] | Bonds Maturing January 2020, 1.850% Coupon [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 1.85% |
Current maturities of long-term debt | $ 250 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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