Debt and Credit Facilities (Summary of Debt and Related Terms) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	3.50%	3.62%
Unsecured Debt	$ 24,564	$ 23,669
Secured Debt	5,584	4,270
First mortgage bonds	31,026	29,177
Finance leases	915	845
Tax exempt bonds	360	477
Notes payable and commercial paper	3,929	3,407
Fair value hedge carrying value adjustment	4	4
Unamortized debt discount and premium, net	1,119	1,217
Unamortized debt issuance costs	(362)	(330)
Total debt	67,139	62,736
Short-term notes payable and commercial paper	(3,304)	(2,873)
Current maturities of long-term debt	(3,387)	(4,238)
Total long-term debt	60,448	55,625
Short term obligations classified as long-term debt	$ 937	$ 937
Unsecured Debt
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	3.71%	3.71%
Secured Debt
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	2.50%	2.67%
First Mortgage Bonds
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	3.87%	4.00%
Capital Lease Obligations
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	5.81%	6.96%
Tax Exempt Bonds
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	0.65%	0.75%
Short term obligations classified as long-term debt	$ 312	$ 312
Notes Payable And Commercial Paper
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	0.35%	0.51%
Short term obligations classified as long-term debt	$ 625	$ 625
Weighted average days to maturity	15 days	23 days
Parent Company | Purchase Accounting Adjustments
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 29	$ 33
Duke Energy Carolinas
Debt Instrument [Line Items]
Unsecured Debt	1,150	1,150
Secured Debt	1,094	543
First mortgage bonds	10,507	10,008
Finance leases	289	294
Money pool/intercompany borrowings	526	806
Fair value hedge carrying value adjustment	4	4
Unamortized debt discount and premium, net	(21)	(20)
Unamortized debt issuance costs	(67)	(62)
Total debt	13,482	12,723
Short-term money pool/intercompany borrowings	(226)	(506)
Current maturities of long-term debt	(362)	(506)
Total long-term debt	12,894	11,711
Short term obligations classified as long-term debt	300	300
Progress Energy
Debt Instrument [Line Items]
Unsecured Debt	2,250	3,150
Secured Debt	2,397	1,584
First mortgage bonds	15,450	14,100
Finance leases	690	377
Tax exempt bonds	48	48
Money pool/intercompany borrowings	2,959	3,119
Unamortized debt discount and premium, net	(34)	(31)
Unamortized debt issuance costs	(128)	(113)
Total debt	23,632	22,234
Short-term money pool/intercompany borrowings	(2,809)	(2,969)
Current maturities of long-term debt	(1,082)	(1,426)
Total long-term debt	19,741	17,839
Duke Energy Progress
Debt Instrument [Line Items]
Unsecured Debt		700
Secured Debt	1,120	252
First mortgage bonds	8,375	7,875
Finance leases	629	296
Tax exempt bonds	48	48
Money pool/intercompany borrowings	322	445
Unamortized debt discount and premium, net	(19)	(19)
Unamortized debt issuance costs	(54)	(44)
Total debt	10,421	9,553
Short-term money pool/intercompany borrowings	(172)	(295)
Current maturities of long-term debt	(556)	(603)
Total long-term debt	9,693	8,655
Short term obligations classified as long-term debt	150	150
Duke Energy Progress | Purchase Accounting Adjustments
Debt Instrument [Line Items]
Finance leases		24
Duke Energy Florida
Debt Instrument [Line Items]
Unsecured Debt	150	350
Secured Debt	1,278	1,332
First mortgage bonds	7,075	6,225
Finance leases	61	81
Money pool/intercompany borrowings	199	196
Unamortized debt discount and premium, net	(14)	(11)
Unamortized debt issuance costs	(68)	(62)
Total debt	8,681	8,111
Short-term money pool/intercompany borrowings	(199)	(196)
Current maturities of long-term debt	(76)	(823)
Total long-term debt	8,406	7,092
Duke Energy Florida | Purchase Accounting Adjustments
Debt Instrument [Line Items]
Finance leases	256	341
Duke Energy Ohio
Debt Instrument [Line Items]
Unsecured Debt	1,330	1,180
First mortgage bonds	1,850	1,850
Tax exempt bonds	27	77
Money pool/intercompany borrowings	128	194
Unamortized debt discount and premium, net	(27)	(29)
Unamortized debt issuance costs	(13)	(14)
Total debt	3,295	3,258
Short-term money pool/intercompany borrowings	(103)	(169)
Current maturities of long-term debt		(50)
Total long-term debt	3,192	3,039
Short term obligations classified as long-term debt	52	52
Duke Energy Ohio | Tax Exempt Bonds
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	27	27
Duke Energy Indiana
Debt Instrument [Line Items]
Unsecured Debt	700	403
First mortgage bonds	3,219	3,219
Finance leases	10	10
Tax exempt bonds	285	352
Money pool/intercompany borrowings	150	281
Unamortized debt discount and premium, net	(18)	(18)
Unamortized debt issuance costs	(23)	(25)
Total debt	4,323	4,222
Short-term money pool/intercompany borrowings		(131)
Current maturities of long-term debt	(84)	(70)
Total long-term debt	4,239	4,021
Short term obligations classified as long-term debt	435	435
Duke Energy Indiana | Tax Exempt Bonds
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	285	285
Piedmont
Debt Instrument [Line Items]
Unsecured Debt	2,990	2,800
Money pool/intercompany borrowings	518	530
Unamortized debt discount and premium, net	(6)	(5)
Unamortized debt issuance costs	(16)	(15)
Total debt	3,486	3,310
Short-term money pool/intercompany borrowings	(518)	(530)
Current maturities of long-term debt		(160)
Total long-term debt	2,968	2,620
Progress Energy | Purchase Accounting Adjustments
Debt Instrument [Line Items]
Unamortized debt discount and premium, net	1,121	1,196
Piedmont | Purchase Accounting Adjustments
Debt Instrument [Line Items]
Unamortized debt discount and premium, net	$ 100	$ 117