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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-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

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- Definition

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.

+ References

No definition available.

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

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Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Dec. 31, 2015	Sep. 30, 2015
Debt Instrument [Line Items]
Debt issuances		$ 1,700
March 2015 3.750% First Mortgage Bond maturing June 2045 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Repayments of debt		$ 500
Interest rate		3.75%
Debt issuances		$ 500
August 2015 3.250% First Mortgage Bond maturing August 2025 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest rate		3.25%
Debt issuances		$ 500
August 2015 3.250% First Mortgage Bond maturing August 2025 [Member] \| First Mortgage Bonds [Member] \| Scenario, Forecast [Member]
Debt Instrument [Line Items]
Repayments of debt	$ 400
August 2015 4.200% First Mortgage Bond maturing August 2045 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest rate		4.20%
Debt issuances		$ 700
August 2015 4.200% First Mortgage Bond maturing August 2045 [Member] \| First Mortgage Bonds [Member] \| Scenario, Forecast [Member]
Debt Instrument [Line Items]
Repayments of debt	400
Duke Energy Carolinas [Member]
Debt Instrument [Line Items]
Debt issuances		500
Duke Energy Carolinas [Member] \| March 2015 3.750% First Mortgage Bond maturing June 2045 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Repayments of debt		$ 500
Interest rate		3.75%
Debt issuances		$ 500
Duke Energy Progress [Member]
Debt Instrument [Line Items]
Debt issuances		$ 1,200
Duke Energy Progress [Member] \| August 2015 3.250% First Mortgage Bond maturing August 2025 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest rate		3.25%
Debt issuances		$ 500
Duke Energy Progress [Member] \| August 2015 3.250% First Mortgage Bond maturing August 2025 [Member] \| First Mortgage Bonds [Member] \| Scenario, Forecast [Member]
Debt Instrument [Line Items]
Repayments of debt	400
Duke Energy Progress [Member] \| August 2015 4.200% First Mortgage Bond maturing August 2045 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest rate		4.20%
Debt issuances		$ 700
Duke Energy Progress [Member] \| August 2015 4.200% First Mortgage Bond maturing August 2045 [Member] \| First Mortgage Bonds [Member] \| Scenario, Forecast [Member]
Debt Instrument [Line Items]
Repayments of debt	$ 400