Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt issuances	$ 8,107,000,000	$ 5,550,000,000
Repayments of long-term debt	$ 5,294,000,000	$ 4,506,000,000	$ 3,476,000,000
March 2021 Notes Due March 2031 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	2.50%
Debt issuances	$ 350,000,000
June 2021 Notes Due June 2023 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	0.299%
Debt issuances	$ 500,000,000
June 2021 Notes Due June 2031 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	2.55%
Debt issuances	$ 1,000,000,000
June 2021 Notes Due June 2041 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	3.30%
Debt issuances	$ 750,000,000
June 2021 Notes Due June 2051 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	3.50%
Debt issuances	$ 750,000,000
September 2021 Notes Due January 2082 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	3.25%
Debt issuances	$ 500,000,000
Repayments of long-term debt	$ 500,000,000
Interest rate reset period	5 years
November 2021 Notes Due July 2031 | Secured Debt
Debt Instrument [Line Items]
Interest Rate	1.679%
Debt issuances	$ 100,000,000
November 2021 Notes Due July 2041 | Secured Debt
Debt Instrument [Line Items]
Interest Rate	2.617%
Debt issuances	$ 137,000,000
November 2021 Notes Due July 2028 | Secured Debt
Debt Instrument [Line Items]
Interest Rate	1.295%
Debt issuances	$ 221,000,000
November 2021 Notes Due July 2037 | Secured Debt
Debt Instrument [Line Items]
Interest Rate	2.387%
Debt issuances	$ 352,000,000
November 2021 Notes Due July 2041 (2) | Secured Debt
Debt Instrument [Line Items]
Interest Rate	2.799%
Debt issuances	$ 197,000,000
April 2021 Notes Due April 2031 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	2.55%
Debt issuances	$ 550,000,000
April 2021 Notes Due April 2051 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	3.45%
Debt issuances	$ 450,000,000
August 2021 Notes Due August 2031 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	2.00%
Debt issuances	$ 650,000,000
August 2021 Notes Due August 2051 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	2.90%
Debt issuances	$ 450,000,000
December 2021 Notes Due December 2031 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	2.40%
Debt issuances	$ 650,000,000
December 2021 Notes Due December 2051 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	3.00%
Debt issuances	$ 500,000,000
May 2020 Debt Issuance Due June 2030 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		2.45%
Debt issuances		$ 500,000,000
May 2020 Debt Issuance Due June 2030 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		2.125%
Debt issuances		$ 400,000,000
May 2020 Debt Issuance Due June 2050 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		3.35%
Debt issuances		$ 400,000,000
August 2020 Debt Issuance Due February 2022 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		0.40%
Debt issuances		$ 700,000,000
September 2020 Debt Issuance Due September 2025 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		0.90%
Debt issuances		$ 650,000,000
September 2020 Debt Issuance Due June 2030 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		2.45%
Debt issuances		$ 350,000,000
January 2020 Debt Issuance 2.450% Coupon Due 2030 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		2.45%
Debt issuances		$ 500,000,000
January 2020 Debt Issuance 3.20% Due August 2049 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		3.20%
Debt issuances		$ 400,000,000
March 2020 Debt Issuance 2.750% Due April 2050 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		2.75%
Debt issuances		$ 550,000,000
June 2020 Debt Issuance Due June 2030 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		1.75%
Debt issuances		$ 500,000,000
August 2020 Debt Issuance Due August 2050 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		2.50%
Debt issuances		$ 600,000,000
Parent Company
Debt Instrument [Line Items]
Debt issuances	3,500,000,000	1,500,000,000
Parent Company | May 2020 Debt Issuance Due June 2030 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances		500,000,000
Parent Company | September 2020 Debt Issuance Due September 2025 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances		650,000,000
Parent Company | September 2020 Debt Issuance Due June 2030 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances		350,000,000
Duke Energy Parent
Debt Instrument [Line Items]
Repayments of long-term debt	1,750,000,000
Duke Energy Parent | June 2021 Notes Due June 2023 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	500,000,000
Duke Energy Parent | June 2021 Notes Due June 2031 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	1,000,000,000
Duke Energy Parent | June 2021 Notes Due June 2041 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	750,000,000
Duke Energy Parent | June 2021 Notes Due June 2051 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	750,000,000
Duke Energy Parent | September 2021 Notes Due January 2082 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	500,000,000
Duke Energy Parent | Term Loan Due March 2021
Debt Instrument [Line Items]
Repayments of long-term debt		1,700,000,000
Duke Energy Carolinas
Debt Instrument [Line Items]
Debt issuances	1,237,000,000	900,000,000
Repayments of long-term debt	617,000,000	813,000,000	6,000,000
Duke Energy Carolinas | November 2021 Notes Due July 2031 | Secured Debt
Debt Instrument [Line Items]
Debt issuances	100,000,000
Duke Energy Carolinas | November 2021 Notes Due July 2041 | Secured Debt
Debt Instrument [Line Items]
Debt issuances	137,000,000
Duke Energy Carolinas | April 2021 Notes Due April 2031 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	550,000,000
Duke Energy Carolinas | April 2021 Notes Due April 2051 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	450,000,000
Duke Energy Carolinas | Bonds Maturing June 2021, 3.900% Coupon | First Mortgage Bonds
Debt Instrument [Line Items]
Repayments of long-term debt	500,000,000
Duke Energy Carolinas | January 2020 Debt Issuance 2.450% Coupon Due 2030 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances		500,000,000
Duke Energy Carolinas | January 2020 Debt Issuance 3.20% Due August 2049 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances		400,000,000
Duke Energy Carolinas | Bonds Maturing June 2020, 4.300% Coupon | First Mortgage Bonds
Debt Instrument [Line Items]
Repayments of long-term debt		450,000,000
Duke Energy Progress
Debt Instrument [Line Items]
Debt issuances	1,870,000,000	1,300,000,000
Repayments of long-term debt	1,308,000,000	1,085,000,000	605,000,000
Duke Energy Progress | First Mortgage Bonds
Debt Instrument [Line Items]
Repayments of long-term debt	600,000,000
Duke Energy Progress | Term Loan
Debt Instrument [Line Items]
Repayments of long-term debt		700,000,000
Duke Energy Progress | November 2021 Notes Due July 2028 | Secured Debt
Debt Instrument [Line Items]
Debt issuances	221,000,000
Duke Energy Progress | November 2021 Notes Due July 2037 | Secured Debt
Debt Instrument [Line Items]
Debt issuances	352,000,000
Duke Energy Progress | November 2021 Notes Due July 2041 (2) | Secured Debt
Debt Instrument [Line Items]
Debt issuances	197,000,000
Duke Energy Progress | August 2021 Notes Due August 2031 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	650,000,000
Duke Energy Progress | August 2021 Notes Due August 2051 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	450,000,000
Duke Energy Progress | August 2020 Debt Issuance Due February 2022 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances		700,000,000
Duke Energy Progress | August 2020 Debt Issuance Due August 2050 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances		600,000,000
Duke Energy Progress | Bonds Due September 2020 | First Mortgage Bonds
Debt Instrument [Line Items]
Repayments of long-term debt		300,000,000
Duke Energy Florida
Debt Instrument [Line Items]
Debt issuances	1,150,000,000	500,000,000
Repayments of long-term debt	575,000,000	572,000,000	262,000,000
Duke Energy Florida | December 2021 Notes Due December 2031 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	650,000,000
Duke Energy Florida | December 2021 Notes Due December 2051 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	500,000,000
Duke Energy Florida | June 2020 Debt Issuance Due June 2030 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances		500,000,000
Piedmont
Debt Instrument [Line Items]
Debt issuances	350,000,000	400,000,000
Repayments of long-term debt	160,000,000		350,000,000
Piedmont | Unsecured Debt
Debt Instrument [Line Items]
Repayments of long-term debt	160,000,000
Piedmont | March 2021 Notes Due March 2031 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	350,000,000
Piedmont | May 2020 Debt Issuance Due June 2050 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances		400,000,000
Duke Energy Ohio
Debt Instrument [Line Items]
Debt issuances		400,000,000
Repayments of long-term debt	50,000,000		551,000,000
Duke Energy Ohio | May 2020 Debt Issuance Due June 2030 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances		400,000,000
Duke Energy Indiana
Debt Instrument [Line Items]
Debt issuances		550,000,000
Repayments of long-term debt	$ 70,000,000	513,000,000	$ 213,000,000
Duke Energy Indiana | March 2020 Debt Issuance 2.750% Due April 2050 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances		550,000,000
Duke Energy Indiana | Bonds Due July 2020 | First Mortgage Bonds
Debt Instrument [Line Items]
Repayments of long-term debt		500,000,000
Revolving Credit Facility | Duke Energy Parent
Debt Instrument [Line Items]
Repayments of long-term debt		$ 500,000,000