Condensed Consolidated Statements of Cash Flows - Duke Energy Piedmont - 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)
Gains on sales of other assets	(52)	(22)	(13)
Impairment of assets and other charges	85	434	353
Deferred income taxes	3	(200)	191
Contributions to qualified pension plans	(100)	(58)
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)
Contributions to equity method investments	(34)	(58)	(81)
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
Piedmont
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	379	323	310
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	239	225	216
Equity component of AFUDC	(21)	(11)	(20)
Impairment of assets and other charges	(4)	18	10
Deferred income taxes	38	5	4
Contributions to qualified pension plans	(3)	(2)
Equity in earnings from unconsolidated affiliates	(9)	(8)	(9)
Provision for rate refunds		(3)	(4)
(Increase) decrease in
Receivables	127	(111)	(77)
Receivables from affiliated companies	1		(1)
Inventory	58	(63)	(40)
Other current assets	(46)	32	33
Increase (decrease) in
Accounts payable	(45)	40	(25)
Accounts payable to affiliated companies	3	11	(39)
Taxes accrued	15	11	37
Other current liabilities	27	36	(26)
Other assets	(7)	5	26
Other liabilities	10	(1)	(4)
Net cash provided by operating activities	762	507	391
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,036)	(862)	(850)
Contributions to equity method investments		(8)	(9)
Other	(54)	(26)	(31)
Net cash used in investing activities	(1,090)	(896)	(890)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	348	394	347
Payments for the redemption of long-term debt	(45)		(160)
Notes payable to affiliated companies	25	(4)	(13)
Contribution from parent			325
Other		(1)
Net cash provided by financing activities	328	389	499
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	162	135	114
Cash paid for (received from) income taxes	28	23	(13)
Significant non-cash transactions:
Accrued capital expenditures	$ 223	$ 207	$ 97