Income Taxes (Effective Tax Rates) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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%		$ 856	$ 838	$ 193
State income tax, net of federal income tax effect		(17)	1	(80)
Amortization of excess deferred income tax		(481)	(438)	(276)
AFUDC equity income		(41)	(34)	(48)
AFUDC equity depreciation		36	35	103
Other tax credits		(43)	(30)	(37)
Tax true up				(12)
Valuation allowance	$ (85)		(85)
Other items, net		(10)	(19)	(12)
Income tax expense from continuing operations		$ 300	$ 268	$ (169)
Effective tax rate		7.40%	6.70%	(18.40%)
Federal capital gain	$ 426
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%		$ 362	$ 291	$ 219
State income tax, net of federal income tax effect		(23)	(44)	(40)
Amortization of excess deferred income tax		(195)	(184)	(82)
AFUDC equity income		(20)	(14)	(13)
AFUDC equity depreciation		18	18	19
Other tax credits		(12)	(12)	(13)
Tax true up				(3)
Other items, net		(4)	(4)	1
Income tax expense from continuing operations		$ 126	$ 51	$ 88
Effective tax rate		7.30%	3.70%	8.40%
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%		$ 457	$ 384	$ 243
State income tax, net of federal income tax effect		44	34	4
Amortization of excess deferred income tax		(133)	(174)	(118)
AFUDC equity income		(14)	(11)	(9)
AFUDC equity depreciation		12	10	10
Other tax credits		(16)	(11)	(16)
Tax true up				1
Other items, net		(2)	(5)	(2)
Income tax expense from continuing operations		$ 348	$ 227	$ 113
Effective tax rate		16.00%	12.40%	9.70%
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%		$ 245	$ 224	$ 80
State income tax, net of federal income tax effect		6	(14)	(25)
Amortization of excess deferred income tax		(74)	(120)	(68)
AFUDC equity income		(11)	(7)	(6)
AFUDC equity depreciation		6	5	5
Other tax credits		(9)	(8)	(14)
Tax true up				(5)
Other items, net		(5)	(5)	(3)
Income tax expense from continuing operations		$ 158	$ 75	$ (36)
Effective tax rate		13.60%	7.00%	(9.50%)
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%		$ 238	$ 194	$ 204
State income tax, net of federal income tax effect		48	47	39
Amortization of excess deferred income tax		(59)	(54)	(49)
AFUDC equity income		(3)	(3)	(3)
AFUDC equity depreciation		6	5	5
Other tax credits		(7)	(3)	(2)
Tax true up				5
Other items, net		2	1	(1)
Income tax expense from continuing operations		$ 225	$ 187	$ 198
Effective tax rate		19.80%	20.20%	20.40%
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%		$ 59	$ 49	$ 62
State income tax, net of federal income tax effect		3	2	2
Amortization of excess deferred income tax		(79)	(22)	(20)
AFUDC equity income		(1)	(2)	(2)
AFUDC equity depreciation		1	2	1
Other tax credits		(2)	(1)	(1)
Other items, net		(2)	2	1
Income tax expense from continuing operations		$ (21)	$ 30	$ 43
Effective tax rate		(7.50%)	12.80%	14.60%
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%		$ 24	$ 123	$ 103
State income tax, net of federal income tax effect		2	18	19
Amortization of excess deferred income tax		(48)	(34)	(36)
AFUDC equity income		(2)	(4)	(4)
AFUDC equity depreciation		4	5	4
Other tax credits		(3)	(2)	(3)
Tax true up				(1)
Other items, net		(1)	1	2
Income tax expense from continuing operations		$ (24)	$ 107	$ 84
Effective tax rate		(21.20%)	18.20%	17.10%
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%		$ 76	$ 71	$ 61
State income tax, net of federal income tax effect		(4)	(8)	(12)
Amortization of excess deferred income tax		(23)	(25)	(21)
AFUDC equity income		(2)	(4)	(10)
Other tax credits		(8)	(4)	(2)
Tax true up				1
Other items, net				1
Income tax expense from continuing operations		$ 39	$ 30	$ 18
Effective tax rate		10.80%	8.80%	6.20%