Condensed Consolidated Statements of Cash Flows - Duke Energy Piedmont - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 1,836	$ 3,186
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	4,538	4,414
Equity component of AFUDC	(146)	(151)
Impairment of assets and other charges	96	202
Deferred income taxes	(29)	209
Equity in earnings of unconsolidated affiliates	(70)	(87)
Contributions to qualified pension plans	(100)	(58)
Provision for rate refunds	(59)	(97)
(Increase) decrease in
Receivables	481	(356)
Inventory	(531)	(290)
Other current assets	40	(2,403)
Increase (decrease) in
Accounts payable	(972)	504
Taxes accrued	277	206
Other current liabilities	(116)	263
Other assets	491	(68)
Other liabilities	368	188
Net cash provided by operating activities	7,309	5,188
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(9,310)	(8,148)
Contributions to equity method investments	(30)	(37)
Other	(578)	(517)
Net cash used in investing activities	(9,751)	(8,630)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	8,704	9,466
Other	(95)	(124)
Net cash provided by financing activities	2,413	3,551
Net (decrease) increase in cash, cash equivalents and restricted cash	(29)	109
Cash, cash equivalents and restricted cash at beginning of period	603	520
Cash, cash equivalents and restricted cash at end of period	574	629
Significant non-cash transactions:
Accrued capital expenditures	1,528	1,387
Piedmont
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	221	180
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	177	168
Equity component of AFUDC	(15)	(7)
Impairment of assets and other charges	(4)	1
Deferred income taxes	52	13
Equity in earnings of unconsolidated affiliates	(6)	(5)
Contributions to qualified pension plans	(3)	(2)
Provision for rate refunds	0	(3)
(Increase) decrease in
Receivables	335	198
Receivables from affiliated companies	(1)	1
Inventory	83	(26)
Other current assets	(63)	(91)
Increase (decrease) in
Accounts payable	(78)	24
Accounts payable to affiliated companies	(3)	(5)
Taxes accrued	(30)	(18)
Other current liabilities	25	23
Other assets	(23)	(8)
Other liabilities	7	(3)
Net cash provided by operating activities	674	440
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(774)	(598)
Contributions to equity method investments		(8)
Other	(32)	(17)
Net cash used in investing activities	(806)	(623)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	348	394
Notes payable to affiliated companies	(216)	(210)
Other	0	(1)
Net cash provided by financing activities	132	183
Significant non-cash transactions:
Accrued capital expenditures	$ 149	$ 163