Condensed Consolidated Statements of Cash Flows - Duke Energy Ohio - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 2,841	$ 2,550	$ 3,908
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	6,084	5,843	5,663
Equity component of AFUDC	(198)	(197)	(171)
Impairment of assets and other charges	85	434	353
Deferred income taxes	3	(200)	191
Contributions to qualified pension plans	(100)	(58)
Payments for asset retirement obligations	(632)	(584)	(540)
Provision for rate refunds	(63)	(130)	(70)
(Increase) decrease in
Receivables	443	(788)	(297)
Inventory	(706)	(476)	(34)
Other current assets	(267)	(1,498)	(1,136)
Increase (decrease) in
Accounts payable	(800)	805	249
Taxes accrued	126	10	284
Other current liabilities	(26)	(153)	(13)
Other assets	914	(1,577)	125
Other liabilities	584	410	95
Net cash provided by operating activities	9,878	5,927	8,290
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(12,604)	(11,367)	(9,715)
Other	(799)	(727)	(333)
Net cash used in investing activities	(12,475)	(11,973)	(10,935)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	10,028	11,874	9,052
Payments for the redemption of long-term debt	(4,737)	(4,396)	(5,294)
Other	(124)	(130)	(94)
Net cash provided by financing activities	2,351	6,129	2,609
Net (decrease) increase in cash, cash equivalents and restricted cash	(246)	83	(36)
Cash, cash equivalents and restricted cash at beginning of period	603	520	556
Cash, cash equivalents and restricted cash at end of period	357	603	520
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	2,883	2,361	2,248
Cash paid for (received from) income taxes	1	(6)	(3)
Significant non-cash transactions:
Accrued capital expenditures	1,908	1,766	1,325
Duke Energy Ohio
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	334	302	204
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	371	328	311
Equity component of AFUDC	(9)	(7)	(7)
Impairment of assets and other charges	3	(10)	25
Deferred income taxes	113	(22)	42
Contributions to qualified pension plans	(5)	(3)
Payments for asset retirement obligations	(13)	(12)	(2)
Provision for rate refunds	0	5	16
(Increase) decrease in
Receivables	(38)	23	6
Receivables from affiliated companies	(40)	(5)	(25)
Inventory	(35)	(28)	(6)
Other current assets	(23)	(55)	(60)
Increase (decrease) in
Accounts payable	(34)	44	38
Accounts payable to affiliated companies	(1)	8	(4)
Taxes accrued	(1)	42	26
Other current liabilities	(54)	(63)	11
Other assets	(24)	(29)	(43)
Other liabilities	(38)	64	27
Net cash provided by operating activities	506	582	559
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(939)	(850)	(848)
Proceeds from the sales of other assets	75
Notes receivable from affiliated companies	(48)	105	10
Other	(67)	(67)	(60)
Net cash used in investing activities	(883)	(1,022)	(918)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	774	50	150
Payments for the redemption of long-term debt	(500)		(50)
Notes payable to affiliated companies	116	395	(67)
Contribution from parent			325
Other	(5)	(2)
Net cash provided by financing activities	385	443	358
Net (decrease) increase in cash, cash equivalents and restricted cash	8	3	(1)
Cash, cash equivalents and restricted cash at beginning of period	16	13	14
Cash, cash equivalents and restricted cash at end of period	24	16	13
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	158	126	107
Cash paid for (received from) income taxes	58	(35)	9
Significant non-cash transactions:
Accrued capital expenditures	$ 115	$ 123	$ 135