Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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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