Debt and Credit Facilities (Tables)

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Schedule of Debt

The following tables summarize outstanding debt.

	December 31, 2023
	Weighted
	Average				Duke				Duke		Duke		Duke		Duke
	Interest		Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Rate		Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Unsecured debt, maturing 2024-2082	4.36	%	$	30,435	$	1,150	$	1,800	$	—	$	150	$	1,155	$	393	$	3,695
Secured debt, maturing 2024-2052	4.23	%	4,202		1,441		2,379		1,121		1,258		—		—		—
First mortgage bonds, maturing 2025-2073(a)	4.18	%	37,443		12,955		18,550		9,475		9,075		2,300		3,638		—
Finance leases, maturing 2024-2051(b)			639		277		571		552		19		—		9		—
Tax-exempt bonds, maturing 2027-2046(c)	3.89	%	1,331		—		500		500		—		77		352		—
Notes payable and commercial paper(d)	5.58	%	4,925		—		—		—		—		—		—		—
Money pool/intercompany borrowings			—		968		1,193		1,041		152		638		407		538
Fair value hedge carrying value adjustment			32		—		—		—		—		—		—		—
Unamortized debt discount and premium, net(e)			916		(29)		(46)		(24)		(20)		(24)		(16)		(8)
Unamortized debt issuance costs(f)			(383)		(82)		(145)		(60)		(81)		(15)		(25)		(19)
Total debt	4.35	%	$	79,540	$	16,680	$	24,802	$	12,605	$	10,553	$	4,131	$	4,758	$	4,206
Short-term notes payable and commercial paper			(4,288)		—		—		—		—		—		—		—
Short-term money pool/intercompany borrowings			—		(668)		(1,043)		(891)		(152)		(613)		(256)		(538)
Current maturities of long-term debt(g)			(2,800)		(19)		(661)		(72)		(589)		—		(4)		(40)
Total long-term debt(g)			$	72,452	$	15,993	$	23,098	$	11,642	$	9,812	$	3,518	$	4,498	$	3,628

(a)Substantially all electric utility property is mortgaged under mortgage bond indentures.

(b)Duke Energy includes $63 million of finance lease purchase accounting adjustments related to Duke Energy Florida related to PPAs that are not accounted for as finance leases in their respective financial statements because of grandfathering provisions in GAAP.

(c)Substantially all tax-exempt bonds are secured by first mortgage bonds, letters of credit or the Master Credit Facility.

(d)Includes $625 million classified as Long-Term Debt on the Consolidated Balance Sheets due to the existence of long-term credit facilities that backstop these commercial paper balances, along with Duke Energy’s ability and intent to refinance these balances on a long-term basis. The weighted average days to maturity for Duke Energy's commercial paper program was 23 days.

(e)Duke Energy includes $992 million and $69 million in purchase accounting adjustments related to Progress Energy and Piedmont, respectively.

(f)Duke Energy includes $25 million in purchase accounting adjustments primarily related to the merger with Progress Energy.

(g)Refer to Note 18 for additional information on amounts from consolidated VIEs.

	December 31, 2022
	Weighted
	Average				Duke				Duke		Duke		Duke		Duke
	Interest		Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Rate		Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Unsecured debt, maturing 2023-2082	4.20	%	$	29,585	$	1,150	$	2,600	$	—	$	950	$	1,330	$	697	$	3,390
Secured debt, maturing 2023-2052	3.70	%	4,116		1,317		2,383		1,155		1,228		—		—		—
First mortgage bonds, maturing 2023-2052(a)	3.89	%	32,645		11,306		16,350		8,776		7,576		1,850		3,138		—
Finance leases, maturing 2024-2051(b)			764		284		628		587		41		—		9		—
Tax-exempt bonds, maturing 2027-2046(c)	3.84	%	1,331		—		500		500		—		77		352		—
Notes payable and commercial paper(d)	4.50	%	4,582		—		—		—		—		—		—		—
Money pool/intercompany borrowings			—		1,533		993		389		605		522		585		514
Fair value hedge carrying value adjustment			(5)		—		—		—		—		—		—		—
Unamortized debt discount and premium, net(e)			1,016		(21)		(40)		(23)		(16)		(25)		(17)		(9)
Unamortized debt issuance costs(f)			(331)		(70)		(132)		(59)		(70)		(12)		(22)		(18)
Total debt	4.07	%	$	73,703	$	15,499	$	23,282	$	11,325	$	10,314	$	3,742	$	4,742	$	3,877
Short-term notes payable and commercial paper			(3,952)		—		—		—		—		—		—		—
Short-term money pool/intercompany borrowings			—		(1,233)		(843)		(238)		(605)		(497)		(435)		(514)
Current maturities of long-term debt(g)			(3,878)		(1,018)		(697)		(369)		(328)		(475)		(303)		(45)
Total long-term debt(g)			$	65,873	$	13,248	$	21,742	$	10,718	$	9,381	$	2,770	$	4,004	$	3,318

(a)    Substantially all electric utility property is mortgaged under mortgage bond indentures.

(b)    Duke Energy includes $164 million of finance lease purchase accounting adjustments related to Duke Energy Florida related to PPAs that are not accounted for as finance leases in their respective financial statements because of grandfathering provisions in GAAP.

(c)    Substantially all tax-exempt bonds are secured by first mortgage bonds, letters of credit or the Master Credit Facility.

(d)    Includes $625 million that was classified as Long-Term Debt on the Consolidated Balance Sheets due to the existence of long-term credit facilities that backstop these commercial paper balances, along with Duke Energy’s ability and intent to refinance these balances on a long-term basis. The weighted average days to maturity for Duke Energy's commercial paper programs was 15 days.

(e)    Duke Energy includes $1,057 million and $85 million in purchase accounting adjustments related to Progress Energy and Piedmont, respectively.

(f)    Duke Energy includes $27 million in purchase accounting adjustments primarily related to the merger with Progress Energy.

(g)     Refer to Note 18 for additional information on amounts from consolidated VIEs.

The following table shows the significant components of Current maturities of Long-Term Debt on the Consolidated Balance Sheets. The Duke Energy Registrants currently anticipate satisfying these obligations with cash on hand and proceeds from additional borrowings.

(in millions)	Maturity Date	Interest Rate		December 31, 2023
Unsecured Debt
Duke Energy (Parent) Term Loan Facility(a)	March 2024	6.157	%	1,000
Duke Energy (Parent)	April 2024	3.750	%	1,000
First Mortgage Bonds
Duke Energy Florida(b)	October 2073	4.960	%	200
Other(c)				600
Current maturities of long-term debt				$	2,800

(a)    Debt has a floating interest rate. In January 2024, Duke Energy (Parent) repaid the Term Loan Facility due March 2024.

(b)    While final maturity is October 2073, these first mortgage bonds are classified as Current maturities of long-term debt on the Consolidated Balance Sheets beginning December 31, 2023, based on terms of the indenture, which could require repayment in less than 12 months if exercised by the bondholders.

(c)    Includes finance lease obligations, amortizing debt, tax-exempt bonds with mandatory put options and small bullet maturities.

The following tables show short-term obligations classified as long-term debt.

	December 31, 2023 and 2022
			Duke		Duke		Duke		Duke
	Duke		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Progress		Ohio		Indiana
Tax-exempt bonds	$	312	$	—	$	—	$	27	$	285
Commercial paper(a)	625		300		150		25		150
Total	$	937	$	300	$	150	$	52	$	435

(a)    Progress Energy amounts are equal to Duke Energy Progress amounts.

Schedule of Maturities of Long-term Debt

The following table shows the annual maturities of long-term debt for the next five years and thereafter. Amounts presented exclude short-term notes payable, commercial paper and money pool borrowings and debt issuance costs for the Subsidiary Registrants.

	December 31, 2023
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy(a)		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
2024	$	2,800	$	19	$	664	$	72	$	592	$	—	$	4	$	40
2025	4,177		521		1,040		975		65		245		4		205
2026	4,280		623		345		279		66		45		4		40
2027	2,472		25		797		83		714		77		27		300
2028	4,593		1,276		1,551		737		815		65		157		—
Thereafter	56,375		13,659		19,543		9,652		8,239		3,125		4,347		3,110
Total long-term debt, including current maturities	$	74,697	$	16,123	$	23,940	$	11,798	$	10,491	$	3,557	$	4,543	$	3,695

(a)    Excludes $1,086 million in purchase accounting adjustments related to the Progress Energy merger and the Piedmont acquisition.

Schedule of Long-term Debt Instruments

The following tables summarize significant debt issuances (in millions).

				Year Ended December 31, 2023
						Duke		Duke		Duke		Duke		Duke		Duke
	Maturity	Interest		Duke		Energy		Energy		Energy		Energy		Energy		Energy
Issuance Date	Date	Rate		Energy		(Parent)		Carolinas		Progress		Florida		Ohio		Indiana		Piedmont
Unsecured Debt
April 2023(a)	April 2026	4.125	%	$	1,725	$	1,725	$	—	$	—	$	—	$	—	$	—	$	—
June 2023(b)	June 2033	5.400	%	350		—		—		—		—		—		—		350
September 2023(c)	September 2033	5.750	%	600		600		—		—		—		—		—		—
September 2023(c)	September 2053	6.100	%	750		750		—		—		—		—		—		—
First Mortgage Bonds
January 2023(d)	January 2033	4.950	%	900		—		900		—		—		—		—		—
January 2023(d)	January 2053	5.350	%	900		—		900		—		—		—		—		—
March 2023(e)	March 2033	5.250	%	500		—		—		500		—		—		—		—
March 2023(e)	March 2053	5.350	%	500		—		—		500		—		—		—		—
March 2023(f)	April 2033	5.250	%	375		—		—		—		—		375		—		—
March 2023(f)	April 2053	5.650	%	375		—		—		—		—		375		—		—
March 2023(g)	April 2053	5.400	%	500		—		—		—		—		—		500		—
June 2023(h)	January 2033	4.950	%	350		—		350		—		—		—		—		—
June 2023(h)	January 2054	5.400	%	500		—		500		—		—		—		—		—
September 2023(h)	October 2073	4.960	%	200		—		—		—		200		—		—		—
November 2023(i)	November 2033	5.875	%	600		—		—		—		600		—		—		—
November 2023(i)	November 2053	6.200	%	700		—		—		—		700		—		—		—
Total issuances				$	9,825	$	3,075	$	2,650	$	1,000	$	1,500	$	750	$	500	$	350

(a)See "Duke Energy (Parent) Convertible Senior Notes" below for additional information.

(b)Debt issued to repay $45 million of maturities due October 2023, to pay down a portion of short-term debt and for general corporate purposes.

(c)Debt issued to repay $400 million of maturities due October 2023, to pay down a portion of short-term debt and for general corporate purposes.

(d)Debt issued to repay $1 billion of maturities due March 2023, to pay down a portion of short-term debt and for general company purposes.

(e)Debt issued to repay $300 million of maturities due September 2023, to pay down a portion of short-term debt and for general company purposes.

(f)Debt issued to repay $300 million of maturities due September 2023, to pay down a portion of the $100 million Duke Energy Ohio Term Loan due October 2023, to repay a portion of short-term debt and for general corporate purposes.

(g)Debt issued to repay the $300 million Duke Energy Indiana Term Loan due October 2023, to pay down a portion of short-term debt and for general company purposes.

(h)Debt issued to pay down a portion of short-term debt and for general company purposes.

(i)Debt issued to repay the $800 million Duke Energy Florida Term Loan due April 2024, to pay down a portion of short-term debt and for general company purposes.

				Year Ended December 31, 2022
						Duke		Duke		Duke		Duke
	Maturity	Interest		Duke		Energy		Energy		Energy		Energy
Issuance Date	Date	Rate		Energy		(Parent)		Carolinas		Progress		Florida		Piedmont
Unsecured Debt
May 2022(a)	May 2052	5.050	%	$	400	$	—	$	—	$	—	$	—	$	400
June 2022(b)	June 2028	4.750	%	645		645		—		—		—		—
June 2022(b)	June 2034	5.306	%	537		537		—		—		—		—
August 2022(c)	March 2028	4.300	%	900		900		—		—		—		—
August 2022(c)	August 2032	4.500	%	1,150		1,150		—		—		—		—
August 2022(c)	August 2052	5.000	%	1,150		1,150		—		—				—
December 2022(c)	December 2025	5.000	%	500		500		—		—		—		—
December 2022(c)	December 2027	5.000	%	500		500		—		—		—		—
First Mortgage Bonds
March 2022(d)	March 2032	2.850	%	500		—		500		—		—		—
March 2022(d)	March 2052	3.550	%	650		—		650		—		—		—
March 2022(d)	April 2032	3.400	%	500		—		—		500		—		—
March 2022(d)	April 2052	4.000	%	400		—		—		400		—		—
November 2022(e)	November 2052	5.950	%	500		—		—		—		500		—
Tax-exempt Bonds				—		—		—		—				—
June 2022(f)	September 2030	4.000	%	168		168		—		—		—		—
June 2022(f)	November 2039	4.250	%	234		234		—		—		—		—
September 2022(g)	October 2046	3.300	%	200		—		—		200				—
September 2022(h)	October 2046	3.700	%	210		—		—		210				—
September 2022(h)	October 2046	4.000	%	42		—		—		42				—
Total issuances				$	9,186	$	5,784	$	1,150	$	1,352	$	500	$	400

(a)Debt issued to repay a portion of short-term debt and for general corporate purposes.

(b)Duke Energy (Parent) issued 600 million euros aggregate principal amount of 3.10% senior notes due June 2028 and 500 million euros aggregate principal amount of 3.85% senior notes due June 2034. Debt issued to repay a $500 million debt maturity, pay down a portion of short-term debt and for general corporate purposes. Duke Energy's obligations under its euro-denominated fixed-rate notes were effectively converted to fixed-rate U.S. dollars at issuance through cross-currency swaps, mitigating foreign currency exchange risk associated with the interest and principal payments. See Note 15 for additional information.

(c)Debt issued to repay a portion of short-term debt and for general corporate purposes.

(d)Debt issued to finance or refinance, in whole or in part, existing or new eligible projects under the sustainable financing framework.

(e)Debt issued to repay a portion of short-term debt and for general company purposes.

(f)Debt issued to refund the Ohio Air Quality Development Revenue Refunding bonds, previously held in treasury, which were used to finance or refinance portions of certain solid waste disposal facilities. The mandatory purchase date of these bonds is June 1, 2027.

(g)Debt issued to provide funds to refund the prior bonds, which were used to finance or refinance portions of certain air and water pollution control equipment and solid waste disposal equipment. The mandatory purchase date of these bonds is October 1, 2026.

(h)Debt issued to provide funds to refund the prior bonds, which were used to finance or refinance portions of certain air and water pollution control equipment and solid waste disposal equipment. The mandatory purchase date of these bonds is October 1, 2030.

Schedule of Line of Credit Facilities

The table below includes the current borrowing sublimits and available capacity under these credit facilities.

	December 31, 2023
			Duke		Duke		Duke		Duke		Duke		Duke
	Duke		Energy		Energy		Energy		Energy		Energy		Energy
(in millions)	Energy		(Parent)		Carolinas		Progress		Florida		Ohio		Indiana		Piedmont
Facility size(a)	$	9,000	$	2,275	$	1,575	$	1,400	$	950	$	1,050	$	950	$	800
Reduction to backstop issuances
Commercial paper(b)	(3,941)		(198)		(968)		(1,041)		(152)		(638)		(406)		(538)
Outstanding letters of credit	(39)		(27)		(4)		(1)		(7)		—		—		—
Tax-exempt bonds	(81)		—		—		—		—		—		(81)		—
Available capacity	$	4,939	$	2,050	$	603	$	358	$	791	$	412	$	463	$	262

(a)    Represents the sublimit of each borrower.

(b)    Duke Energy issued $625 million of commercial paper and loaned the proceeds through the money pool to Duke Energy Carolinas, Duke Energy Progress, Duke Energy Ohio and Duke Energy Indiana. The balances are classified as Long-Term Debt Payable to Affiliated Companies in the Consolidated Balance Sheets.