Leases (Supplemental Financial Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Assets
Operating lease right-of-use assets, net	$ 1,266	$ 1,524
Net property, plant and equipment	950	797
Total lease assets	2,216	2,321
Current
Operating	187	177
Finance	151	129
Noncurrent
Operating	1,074	1,340
Finance	764	716
Total lease liabilities	2,176	2,362
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	245	271
Operating cash flows from finance leases	55	61
Financing cash flows from finance leases	219	119
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	182	116
Finance	$ 322	$ 125
Weighted average remaining lease term (years)
Operating leases	9 years	10 years
Finance leases	10 years	13 years
Weighted-average discount rate
Operating leases	3.60%	3.80%
Finance leases	7.30%	8.40%
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
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	$ 92	$ 110
Net property, plant and equipment	302	312
Total lease assets	394	422
Current
Operating	22	20
Finance	6	5
Noncurrent
Operating	78	97
Finance	283	289
Total lease liabilities	389	411
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	25	31
Operating cash flows from finance leases	33	30
Financing cash flows from finance leases	5	8
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	$ 4	17
Finance		$ 125
Weighted average remaining lease term (years)
Operating leases	9 years	9 years
Finance leases	18 years	19 years
Weighted-average discount rate
Operating leases	3.50%	3.40%
Finance leases	11.60%	11.60%
Progress Energy
Assets
Operating lease right-of-use assets, net	$ 691	$ 690
Net property, plant and equipment	729	416
Total lease assets	1,420	1,106
Current
Operating	94	73
Finance	61	26
Noncurrent
Operating	606	623
Finance	629	351
Total lease liabilities	1,390	1,073
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	117	124
Operating cash flows from finance leases	48	44
Financing cash flows from finance leases	37	$ 24
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	99
Finance	$ 322
Weighted average remaining lease term (years)
Operating leases	8 years	10 years
Finance leases	13 years	15 years
Weighted-average discount rate
Operating leases	3.60%	3.80%
Finance leases	9.00%	11.90%
Duke Energy Progress
Assets
Operating lease right-of-use assets, net	$ 389	$ 346
Net property, plant and equipment	627	297
Total lease assets	1,016	643
Current
Operating	50	31
Finance	41	7
Noncurrent
Operating	350	323
Finance	588	289
Total lease liabilities	1,029	650
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	62	52
Operating cash flows from finance leases	42	37
Financing cash flows from finance leases	18	$ 6
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	99
Finance	$ 322
Weighted average remaining lease term (years)
Operating leases	10 years	12 years
Finance leases	13 years	17 years
Weighted-average discount rate
Operating leases	3.40%	3.90%
Finance leases	9.00%	12.40%
Duke Energy Florida
Assets
Operating lease right-of-use assets, net	$ 302	$ 344
Net property, plant and equipment	102	119
Total lease assets	404	463
Current
Operating	44	42
Finance	20	19
Noncurrent
Operating	256	300
Finance	41	62
Total lease liabilities	361	423
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	55	72
Operating cash flows from finance leases	6	7
Financing cash flows from finance leases	$ 19	$ 18
Weighted average remaining lease term (years)
Operating leases	7 years	8 years
Finance leases	11 years	11 years
Weighted-average discount rate
Operating leases	3.80%	3.80%
Finance leases	8.20%	8.20%
Duke Energy Ohio
Assets
Operating lease right-of-use assets, net	$ 19	$ 20
Total lease assets	19	20
Current
Operating	1	1
Noncurrent
Operating	18	20
Total lease liabilities	19	21
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 2	$ 2
Weighted average remaining lease term (years)
Operating leases	16 years	17 years
Weighted-average discount rate
Operating leases	4.20%	4.20%
Duke Energy Indiana
Assets
Operating lease right-of-use assets, net	$ 53	$ 55
Net property, plant and equipment	7	7
Total lease assets	60	62
Current
Operating	4	3
Noncurrent
Operating	50	53
Finance	10	10
Total lease liabilities	64	66
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	6	6
Financing cash flows from finance leases	$ 1	1
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating		$ 1
Weighted average remaining lease term (years)
Operating leases	16 years	18 years
Finance leases	24 years	25 years
Weighted-average discount rate
Operating leases	4.10%	4.20%
Finance leases	11.90%	11.90%
Piedmont
Assets
Operating lease right-of-use assets, net	$ 16	$ 20
Total lease assets	16	20
Current
Operating	5	4
Noncurrent
Operating	14	19
Total lease liabilities	19	23
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 5	$ 5
Weighted average remaining lease term (years)
Operating leases	4 years	5 years
Weighted-average discount rate
Operating leases	3.60%	3.60%