Debt and Credit Facilities (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Schedule of Debt

The following tables summarize outstanding debt.

	December 31, 2020
	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 2021-2078	3.71	%	$	23,669	$	1,150	$	3,150	$	700	$	350	$	1,180	$	403	$	2,800
Secured debt, maturing 2021-2052	2.67	%	4,270		543		1,584		252		1,332		—		—		—
First mortgage bonds, maturing 2021-2050(a)	4.00	%	29,177		10,008		14,100		7,875		6,225		1,850		3,219		—
Finance leases, maturing 2022-2051(b)	6.96	%	845		294		377		296		81		—		10		—
Tax-exempt bonds, maturing 2027-2041(c)	0.75	%	477		—		48		48		—		77		352		—
Notes payable and commercial paper(d)	0.51	%	3,407		—		—		—		—		—		—		—
Money pool/intercompany borrowings			—		806		3,119		445		196		194		281		530
Fair value hedge carrying value adjustment			4		4		—		—		—		—		—		—
Unamortized debt discount and premium, net(e)			1,217		(20)		(31)		(19)		(11)		(29)		(18)		(5)
Unamortized debt issuance costs(f)			(330)		(62)		(113)		(44)		(62)		(14)		(25)		(15)
Total debt	3.62	%	$	62,736	$	12,723	$	22,234	$	9,553	$	8,111	$	3,258	$	4,222	$	3,310
Short-term notes payable and commercial paper			(2,873)		—		—		—		—		—		—		—
Short-term money pool/intercompany borrowings			—		(506)		(2,969)		(295)		(196)		(169)		(131)		(530)
Current maturities of long-term debt(g)			(4,238)		(506)		(1,426)		(603)		(823)		(50)		(70)		(160)
Total long-term debt(g)			$	55,625	$	11,711	$	17,839	$	8,655	$	7,092	$	3,039	$	4,021	$	2,620

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

(b)Duke Energy includes $24 million and $341 million of finance lease purchase accounting adjustments related to Duke Energy Progress and Duke Energy Florida, respectively, 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 $1,196 million and $117 million in purchase accounting adjustments related to Progress Energy and Piedmont, respectively.

(f)Duke Energy includes $33 million in purchase accounting adjustments primarily related to the merger with Progress Energy.

(g)Refer to Note 17 for additional information on amounts from consolidated VIEs.

	December 31, 2019
	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 2020-2078	4.02	%	$	22,477	$	1,150	$	3,650	$	700	$	350	$	1,110	$	405	$	2,399
Secured debt, maturing 2020-2052	3.30	%	4,537		544		1,722		335		1,387		—		—		—
First mortgage bonds, maturing 2020-2049(a)	4.13	%	27,977		9,557		13,800		7,575		6,225		1,449		3,169		—
Finance leases, maturing 2022-2051(b)	6.60	%	969		179		405		307		98		—		10		—
Tax-exempt bonds, maturing 2022-2041(c)	2.90	%	730		243		48		48		—		77		362		—
Notes payable and commercial paper(d)	1.98	%	3,588		—		—		—		—		—		—		—
Money pool/intercompany borrowings			—		329		1,970		216		—		337		180		476
Fair value hedge carrying value adjustment			5		5		—		—		—		—		—		—
Unamortized debt discount and premium, net(e)			1,294		(23)		(29)		(17)		(11)		(30)		(19)		(2)
Unamortized debt issuance costs(f)			(316)		(55)		(111)		(40)		(62)		(12)		(20)		(13)
Total debt	3.92	%	$	61,261	$	11,929	$	21,455	$	9,124	$	7,987	$	2,931	$	4,087	$	2,860
Short-term notes payable and commercial paper			(3,135)		—		—		—		—		—		—		—
Short-term money pool/intercompany borrowings			—		(29)		(1,821)		(66)		—		(312)		(30)		(476)
Current maturities of long-term debt(g)			(3,141)		(458)		(1,577)		(1,006)		(571)		—		(503)		—
Total long-term debt(g)			$	54,985	$	11,442	$	18,057	$	8,052	$	7,416	$	2,619	$	3,554	$	2,384

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

(b)    Duke Energy includes $44 million and $419 million of finance lease purchase accounting adjustments related to Duke Energy Progress and Duke Energy Florida, respectively, 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 14 days.

(e)    Duke Energy includes $1,275 million and $137 million in purchase accounting adjustments related to Progress Energy and Piedmont, respectively.

(f)    Duke Energy includes $37 million in purchase accounting adjustments primarily related to the merger with Progress Energy.

(g)     Refer to Note 17 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, 2020
Unsecured Debt(a)
Duke Energy (Parent)	May 2021	0.721	%	(b)	$	500
Piedmont	June 2021	4.240	%		160
Duke Energy (Parent)	September 2021	3.550	%		500
Duke Energy (Parent)	September 2021	1.800	%		750
Duke Energy Florida	November 2021	0.482	%	(b)	200
Secured Debt
Duke Energy Florida	April 2021	0.972	%	(b)	250
First Mortgage Bonds
Duke Energy Carolinas	June 2021	3.900	%		500
Duke Energy Florida	August 2021	3.100	%		300
Duke Energy Progress	September 2021	3.000	%		500
Duke Energy Progress	September 2021	8.625	%		100
Other(c)					478
Current maturities of long-term debt					$	4,238

(a)    During October 2020, Progress Energy early retired $500 million of unsecured debt with an original maturity of January 15, 2021.

(b)    Debt has a floating interest rate.

(c)    Includes finance lease obligations, amortizing debt and small bullet maturities.

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

	December 31, 2020
			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

	December 31, 2019
			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, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy(a)		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
2021	$	4,238	$	506	$	1,426	$	603	$	823	$	50	$	70	$	160
2022	4,905		721		1,736		1,208		78		—		84		—
2023	3,356		1,008		638		561		77		325		3		45
2024	1,344		9		76		10		66		—		4		40
2025	3,153		310		725		661		64		270		154		205
Thereafter	41,983		9,745		14,802		6,274		6,878		2,486		3,818		2,350
Total long-term debt, including current maturities	$	58,979	$	12,299	$	19,403	$	9,317	$	7,986	$	3,131	$	4,133	$	2,800

(a)    Excludes $1,346 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, 2020
							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
May 2020(a)	Jun 2030	2.450	%		$	500	$	500	$	—	$	—	$	—	$	—	$	—	$	—
May 2020(b)	Jun 2050	3.350	%		400		—		—		—		—		—		—		400
August 2020(c)	Feb 2022	0.400	%	(d)	700		—		—		700		—		—		—		—
September 2020(e)	Sep 2025	0.900	%		650		650		—		—		—		—		—		—
September 2020(e)	Jun 2030	2.450	%		350		350		—		—		—		—		—		—
First Mortgage Bonds
January 2020(f)	Feb 2030	2.450	%		500		—		500		—		—		—		—		—
January 2020(f)	Aug 2049	3.200	%		400		—		400		—		—		—		—		—
March 2020(g)	Apr 2050	2.750	%		550		—		—		—		—		—		550		—
May 2020(b)	Jun 2030	2.125	%		400		—		—		—		—		400		—		—
June 2020(b)	Jun 2030	1.750	%		500		—		—		—		500		—		—		—
August 2020(h)	Aug 2050	2.500	%		600		—		—		600		—		—		—		—
Total issuances					$	5,550	$	1,500	$	900	$	1,300	$	500	$	400	$	550	$	400

(a)Debt issued to repay $500 million borrowing made under Duke Energy (Parent) revolving credit facility in March 2020, and for general corporate purposes.

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

(c)Debt issued to repay $700 million term loan due December 2020.

(d)Debt issuance has a floating interest rate.

(e)Debt issued to repay a portion of outstanding commercial paper, to repay a portion of Duke Energy (Parent)'s outstanding $1.7 billion term loan due March 2021 and for general corporate purposes.

(f)Debt issued to repay at maturity $450 million first mortgage bonds due June 2020 and for general corporate purposes.

(g)Debt issued to repay at maturity $500 million first mortgage bonds due July 2020 and to pay down short-term debt.

(h)Debt issued to repay at maturity $300 million first mortgage bonds due September 2020 and for general corporate purposes.

					Year Ended December 31, 2019
							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
March 2019(a)	Mar 2022	2.538	%	(b)	$	300	$	300	$	—	$	—	$	—	$	—	$	—	$	—
March 2019(a)	Mar 2022	3.227	%		300		300		—		—		—		—		—		—
May 2019(e)	Jun 2029	3.500	%		600		—		—		—		—		—		—		600
June 2019(a)	Jun 2029	3.400	%		600		600		—		—		—		—		—		—
June 2019(a)	Jun 2049	4.200	%		600		600		—		—		—		—		—		—
July 2019(g)	Jul 2049	4.320	%		40		—		—		—		—		40		—		—
September 2019(g)	Oct 2025	3.230	%		95		—		—		—		—		95		—		—
September 2019(g)	Oct 2029	3.560	%		75		—		—		—		—		75		—		—
November 2019(h)	Nov 2021	2.167	%	(b)	200		—		—		—		200		—		—		—
First Mortgage Bonds
January 2019(c)	Feb 2029	3.650	%		400		—		—		—		—		400		—		—
January 2019(c)	Feb 2049	4.300	%		400		—		—		—		—		400		—		—
March 2019(d)	Mar 2029	3.450	%		600		—		—		600		—		—		—		—
August 2019(a)	Aug 2029	2.450	%		450		—		450		—		—		—		—		—
August 2019(a)	Aug 2049	3.200	%		350		—		350		—		—		—		—		—
September 2019(f)	Oct 2049	3.250	%		500		—		—		—		—		—		500		—
November 2019(i)	Dec 2029	2.500	%		700		—		—		—		700		—		—		—
Total issuances					$	6,210	$	1,800	$	800	$	600	$	900	$	1,010	$	500	$	600

(a)Debt issued to pay down short-term debt and for general corporate purposes.

(b)Debt issuance has a floating interest rate.

(c)Debt issued to repay at maturity $450 million first mortgage bonds due April 2019, pay down short-term debt and for general corporate purposes.

(d)Debt issued to fund eligible green energy projects in the Carolinas.

(e)Debt issued to repay in full the outstanding $350 million Piedmont unsecured term loan due September 2019, pay down short-term debt and for general corporate purposes.

(f)Debt issued to retire $150 million of pollution control bonds, pay down short-term debt and for general corporate purposes.

(g)Debt issued to repay at maturity $100 million debentures due October 2019, pay down short-term debt and for general corporate purposes.

(h)Debt issued to fund storm restoration costs and for general corporate purposes.

(i)Debt issued to reimburse the payment of existing and new Eligible Green Expenditures in Florida.

Schedule Of Line Of Credit Facilities

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

	December 31, 2020
			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)	$	8,000	$	2,650	$	1,475	$	1,250	$	800	$	625	$	600	$	600
Reduction to backstop issuances
Commercial paper(b)	(2,239)		—		(736)		(407)		(179)		(176)		(257)		(484)
Outstanding letters of credit	(40)		(34)		(4)		(2)		—		—		—		—
Tax-exempt bonds	(81)		—		—		—		—		—		(81)		—
Available capacity	$	5,640	$	2,616	$	735	$	841	$	621	$	449	$	262	$	116

(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.