Leases (Supplemental Financial Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Assets
Operating lease right-of-use assets, net	$ 1,092	$ 1,042
Net property, plant and equipment	687	810
Total lease assets	1,779	1,852
Current
Operating	188	179
Finance	115	153
Noncurrent
Operating	917	876
Finance	524	611
Total lease liabilities	1,744	1,819
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	228	230
Operating cash flows from finance leases	46	50
Financing cash flows from finance leases	160	151
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	286	$ 111
Finance	$ 36
Weighted average remaining lease term (years)
Operating leases	9 years	8 years
Finance leases	11 years	10 years
Weighted-average discount rate (as a percent)
Operating leases	3.10%	3.40%
Finance leases	8.50%	7.70%
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Public utilities, property, plant and equipment, net	Public utilities, property, plant and equipment, net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Current Liabilities: Other	Current Liabilities: Other
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Current maturities of long-term debt	Current maturities of long-term debt
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Operating lease liabilities	Operating lease liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-Term Debt	Long-Term Debt
Duke Energy Carolinas
Assets
Operating lease right-of-use assets, net	$ 78	$ 78
Net property, plant and equipment	268	284
Total lease assets	346	362
Current
Operating	15	14
Finance	8	7
Noncurrent
Operating	75	83
Finance	269	277
Total lease liabilities	367	381
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	18	24
Operating cash flows from finance leases	31	32
Financing cash flows from finance leases	7	6
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	$ 14	$ 10
Weighted average remaining lease term (years)
Operating leases	10 years	10 years
Finance leases	16 years	17 years
Weighted-average discount rate (as a percent)
Operating leases	4.00%	3.80%
Finance leases	11.50%	11.50%
Progress Energy
Assets
Operating lease right-of-use assets, net	$ 617	$ 628
Net property, plant and equipment	615	674
Total lease assets	1,232	1,302
Current
Operating	94	96
Finance	46	57
Noncurrent
Operating	544	546
Finance	525	571
Total lease liabilities	1,209	1,270
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	123	118
Operating cash flows from finance leases	45	49
Financing cash flows from finance leases	57	$ 61
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	$ 92
Weighted average remaining lease term (years)
Operating leases	10 years	8 years
Finance leases	11 years	12 years
Weighted-average discount rate (as a percent)
Operating leases	3.80%	3.60%
Finance leases	9.10%	9.10%
Duke Energy Progress
Assets
Operating lease right-of-use assets, net	$ 318	$ 370
Net property, plant and equipment	552	590
Total lease assets	870	960
Current
Operating	45	51
Finance	38	35
Noncurrent
Operating	293	335
Finance	514	552
Total lease liabilities	890	973
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	64	63
Operating cash flows from finance leases	43	45
Financing cash flows from finance leases	35	$ 41
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	$ 1
Weighted average remaining lease term (years)
Operating leases	9 years	9 years
Finance leases	11 years	12 years
Weighted-average discount rate (as a percent)
Operating leases	3.60%	3.50%
Finance leases	9.20%	9.10%
Duke Energy Florida
Assets
Operating lease right-of-use assets, net	$ 299	$ 258
Net property, plant and equipment	63	84
Total lease assets	362	342
Current
Operating	49	45
Finance	8	22
Noncurrent
Operating	251	211
Finance	11	19
Total lease liabilities	319	297
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	59	55
Operating cash flows from finance leases	2	4
Financing cash flows from finance leases	22	$ 20
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	$ 91
Weighted average remaining lease term (years)
Operating leases	11 years	6 years
Finance leases	18 years	12 years
Weighted-average discount rate (as a percent)
Operating leases	4.00%	3.80%
Finance leases	7.60%	8.00%
Duke Energy Ohio
Assets
Operating lease right-of-use assets, net	$ 16	$ 18
Total lease assets	16	18
Current
Operating	1	1
Noncurrent
Operating	16	17
Total lease liabilities	17	18
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	2	$ 2
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	$ 2
Weighted average remaining lease term (years)
Operating leases	13 years	15 years
Weighted-average discount rate (as a percent)
Operating leases	4.20%	4.20%
Duke Energy Indiana
Assets
Operating lease right-of-use assets, net	$ 50	$ 49
Net property, plant and equipment	6	6
Total lease assets	56	55
Current
Operating	6	4
Noncurrent
Operating	46	47
Finance	9	9
Total lease liabilities	61	60
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	7	6
Operating cash flows from finance leases	1	$ 1
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	$ 6
Weighted average remaining lease term (years)
Operating leases	13 years	15 years
Finance leases	22 years	23 years
Weighted-average discount rate (as a percent)
Operating leases	3.90%	4.00%
Finance leases	11.90%	11.90%
Piedmont
Assets
Operating lease right-of-use assets, net	$ 4	$ 4
Total lease assets	4	4
Noncurrent
Operating	10	13
Total lease liabilities	10	13
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases		$ 4
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	$ 2
Weighted average remaining lease term (years)
Operating leases	4 years	1 year
Finance leases	3 years
Weighted-average discount rate (as a percent)
Operating leases	2.40%	3.30%
Finance leases	5.40%