Debt and Credit Facilities (Summary of Current Maturities of Long-term Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 3,884	$ 3,387
Other debt securities
Debt Instrument [Line Items]
Current maturities of long-term debt	584
Progress Energy
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 1,095	1,082
Progress Energy \| Debt Maturing April 2022, 3.150% interest rate \| Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	3.15%
Current maturities of long-term debt	$ 450
Duke Energy (Parent) \| Debt Maturing August 2022, 3.050% interest rate \| Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	3.05%
Current maturities of long-term debt	$ 500
Duke Energy (Parent) \| Debt Maturing August 2022, 2.400% interest rate \| Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	2.40%
Current maturities of long-term debt	$ 500
Duke Energy Carolinas
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 1,367	362
Duke Energy Carolinas \| Debt Maturing May 2022, 3.350% interest rate \| First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	3.35%
Current maturities of long-term debt	$ 350
Duke Energy Carolinas \| Debt Maturing March 2023, 2.500% Coupon \| First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	2.50%
Current maturities of long-term debt	$ 500
Duke Energy Carolinas \| Debt Maturing March 2023, 3.050% Coupon \| First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	3.05%
Current maturities of long-term debt	$ 500
Duke Energy Progress
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 568	$ 556
Duke Energy Progress \| Debt Maturing May 2022, 2.800%, interest rate \| First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	2.80%
Current maturities of long-term debt	$ 500

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: 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=120391452&loc=d3e13212-122682

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+ 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
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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