Income Taxes (Effective Tax Rates) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%	$ 1,001	$ 856	$ 838
State income tax, net of federal income tax effect	43	(17)	1
Amortization of EDIT	(388)	(481)	(438)
AFUDC equity income	(41)	(41)	(34)
AFUDC equity depreciation	37	36	35
Tax credits(b)	(63)	(43)	(30)
Valuation allowance			(85)
Interest on company-owned life insurance	114
Other items, net	(37)	(10)	(19)
Income tax expense from continuing operations	$ 438	$ 300	$ 268
Effective tax rate (as a percent)	9.20%	7.40%	6.70%
Federal capital gain			$ 426
Domestic Tax Authority
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Favorable adjustment amounts	$ 114
State
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Favorable adjustment amounts	6
Duke Energy Carolinas
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%	338	$ 362	291
State income tax, net of federal income tax effect	12	(23)	(44)
Amortization of EDIT	(197)	(195)	(184)
AFUDC equity income	(19)	(20)	(14)
AFUDC equity depreciation	18	18	18
Tax credits(b)	(11)	(12)	(12)
Other items, net		(4)	(4)
Income tax expense from continuing operations	$ 141	$ 126	$ 51
Effective tax rate (as a percent)	8.80%	7.30%	3.70%
Progress Energy
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%	$ 490	$ 457	$ 384
State income tax, net of federal income tax effect	60	44	34
Amortization of EDIT	(114)	(133)	(174)
AFUDC equity income	(14)	(14)	(11)
AFUDC equity depreciation	13	12	10
Tax credits(b)	(46)	(16)	(11)
Other items, net	(12)	(2)	(5)
Income tax expense from continuing operations	$ 377	$ 348	$ 227
Effective tax rate (as a percent)	16.20%	16.00%	12.40%
Duke Energy Progress
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%	$ 241	$ 245	$ 224
State income tax, net of federal income tax effect	18	6	(14)
Amortization of EDIT	(91)	(74)	(120)
AFUDC equity income	(11)	(11)	(7)
AFUDC equity depreciation	6	6	5
Tax credits(b)	(7)	(9)	(8)
Other items, net	(7)	(5)	(5)
Income tax expense from continuing operations	$ 149	$ 158	$ 75
Effective tax rate (as a percent)	13.00%	13.60%	7.00%
Duke Energy Florida
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%	$ 268	$ 238	$ 194
State income tax, net of federal income tax effect	56	48	47
Amortization of EDIT	(23)	(59)	(54)
AFUDC equity income	(3)	(3)	(3)
AFUDC equity depreciation	7	6	5
Tax credits(b)	(39)	(7)	(3)
Other items, net	(5)	2	1
Income tax expense from continuing operations	$ 261	$ 225	$ 187
Effective tax rate (as a percent)	20.40%	19.80%	20.20%
Duke Energy Ohio
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%	$ 83	$ 59	$ 49
State income tax, net of federal income tax effect	(2)	3	2
Amortization of EDIT	(22)	(79)	(22)
AFUDC equity income	(2)	(1)	(2)
AFUDC equity depreciation	2	1	2
Tax credits(b)	(2)	(2)	(1)
Other items, net	6	(2)	2
Income tax expense from continuing operations	$ 63	$ (21)	$ 30
Effective tax rate (as a percent)	15.90%	(7.50%)	12.80%
Duke Energy Indiana
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%	$ 128	$ 24	$ 123
State income tax, net of federal income tax effect	18	2	18
Amortization of EDIT	(33)	(48)	(34)
AFUDC equity income	(2)	(2)	(4)
AFUDC equity depreciation	4	4	5
Tax credits(b)	(2)	(3)	(2)
Other items, net	(3)	(1)	1
Income tax expense from continuing operations	$ 110	$ (24)	$ 107
Effective tax rate (as a percent)	18.10%	(21.20%)	18.20%
Piedmont
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%	$ 97	$ 76	$ 71
State income tax, net of federal income tax effect	12	(4)	(8)
Amortization of EDIT	(20)	(23)	(25)
AFUDC equity income	(4)	(2)	(4)
Tax credits(b)	(1)	(8)	(4)
Income tax expense from continuing operations	$ 84	$ 39	$ 30
Effective tax rate (as a percent)	18.10%	10.80%	8.80%