Condensed Consolidated Statements of Cash Flows - Duke Energy Indiana - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,151	$ 761
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,534	1,344
Equity component of AFUDC	(55)	(46)
Deferred income taxes	149	90
Payments for asset retirement obligations	115	117
(Increase) decrease in
Receivables	226	754
Inventory	11	(275)
Other current assets	329	262
Increase (decrease) in
Accounts payable	(553)	(1,193)
Taxes accrued	(110)	(148)
Other current liabilities	(208)	(266)
Other assets	41	(13)
Other liabilities	149	157
Net cash provided by operating activities	2,474	1,483
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,208)	(3,146)
Purchases of debt and equity securities	(946)	(866)
Proceeds from sales and maturities of debt and equity securities	985	882
Other	(166)	(149)
Net cash used in investing activities	(3,342)	(3,209)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3,481	4,085
Payments for the redemption of long-term debt	(1,392)	(1,380)
Other	(67)	(84)
Net cash provided by financing activities	1,029	1,747
Net increase in cash, cash equivalents and restricted cash	161	21
Cash, cash equivalents and restricted cash at beginning of period	357	603
Cash, cash equivalents and restricted cash at end of period	518	624
Significant non-cash transactions:
Accrued capital expenditures	1,615	1,366
Duke Energy Indiana
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	67	106
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	170	158
Equity component of AFUDC	(2)	(1)
Deferred income taxes	24	2
Payments for asset retirement obligations	12	19
(Increase) decrease in
Receivables	35	20
Receivables from affiliated companies	(6)	(26)
Inventory	48	(71)
Other current assets	30	174
Increase (decrease) in
Accounts payable	(39)	(107)
Accounts payable to affiliated companies	(57)	(33)
Taxes accrued	9	14
Other current liabilities	32	112
Other assets	(13)	(12)
Other liabilities	(7)	35
Net cash provided by operating activities	279	352
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(275)	(226)
Purchases of debt and equity securities	(5)	(23)
Proceeds from sales and maturities of debt and equity securities	4	16
Notes receivable from affiliated companies	(117)	96
Other	(24)	(10)
Net cash used in investing activities	(417)	(147)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	298	495
Payments for the redemption of long-term debt	0	(300)
Notes payable to affiliated companies	(120)	(231)
Distributions to parent	(42)	(188)
Other	(1)	(1)
Net cash provided by financing activities	135	(225)
Net increase in cash, cash equivalents and restricted cash	(3)	(20)
Cash, cash equivalents and restricted cash at beginning of period	8	31
Cash, cash equivalents and restricted cash at end of period	5	11
Significant non-cash transactions:
Accrued capital expenditures	$ 88	$ 85