Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ 1,232	$ 2,964
Net income (loss) (attributable to parent)	1,440	3,074
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	4,081	3,831
Equity in losses (earnings) of unconsolidated affiliates	2,004	(137)
Equity component of AFUDC	(112)	(99)
(Gains) losses on sales of other assets	(10)
Impairment charges	36	(16)
Deferred income taxes	210	736
Contributions to qualified pension plans		(77)
Payments for asset retirement obligations	(463)	(582)
Provision for rate refunds	(15)	61
Refund of AMT credit carryforwards	572
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	87	(4)
Receivables	58	62
Inventory	43	(3)
Other current assets	199	(134)
Increase (decrease) in
Accounts payable	(563)	(538)
Taxes accrued	386	125
Other current liabilities	(284)	(198)
Other assets	(328)	(279)
Other liabilities	(367)	(75)
Net cash provided by operating activities	6,766	5,637
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(7,408)	(8,084)
Contributions to equity method investments	(276)	(264)
Purchases of debt and equity securities	(6,160)	(3,105)
Proceeds from sales and maturities of debt and equity securities	6,087	3,092
Other	(207)	(272)
Net cash used in investing activities	(7,964)	(8,633)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	6,162	6,131
Proceeds from the issuance of preferred stock		1,963
Proceeds from the issuance of common stock	75	41
Payments for the redemption of long-term debt	(3,468)	(2,737)
Proceeds from the issuance of short-term debt with original maturities greater than 90 days	2,372	339
Payments for the redemption of short-term debt with original maturities greater than 90 days	(1,143)	(479)
Notes payable and commercial paper	(969)	(879)
Contributions from noncontrolling interests	402	615
Dividends paid	(2,113)	(1,990)
Other	(93)	(17)
Net cash provided by financing activities	1,225	2,987
Net increase (decrease) in cash, cash equivalents and restricted cash	27	(9)
Cash, cash equivalents and restricted cash at beginning of period	573	591
Cash, cash equivalents and restricted cash at end of period	600	582
Significant non-cash transactions:
Accrued capital expenditures	992	1,073
Non-cash dividends	82	81
Duke Energy Carolinas
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	1,128	1,184
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,295	1,227
Equity component of AFUDC	(46)	(29)
(Gains) losses on sales of other assets	(1)
Impairment charges	22	11
Deferred income taxes	(103)	96
Contributions to qualified pension plans		(7)
Payments for asset retirement obligations	(127)	(234)
Provision for rate refunds	(1)	34
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(7)
Receivables	41	(80)
Receivables from affiliated companies	50	74
Inventory	4	5
Other current assets	197	(117)
Increase (decrease) in
Accounts payable	(313)	(284)
Accounts payable to affiliated companies	(55)	(56)
Taxes accrued	352	91
Other current liabilities	(121)	44
Other assets	(71)	(2)
Other liabilities	(23)	(44)
Net cash provided by operating activities	2,228	1,906
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,931)	(1,984)
Purchases of debt and equity securities	(1,313)	(1,658)
Proceeds from sales and maturities of debt and equity securities	1,313	1,658
Notes receivable from affiliated companies	(65)
Other	(105)	(80)
Net cash used in investing activities	(2,101)	(2,064)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	965	819
Payments for the redemption of long-term debt	(457)	(5)
Notes payable to affiliated companies	(29)	(390)
Distributions to parent	(600)	(275)
Other	(1)	(1)
Net cash provided by financing activities	(122)	148
Net increase (decrease) in cash, cash equivalents and restricted cash	5	(10)
Cash, cash equivalents and restricted cash at beginning of period	18	33
Cash, cash equivalents and restricted cash at end of period	23	23
Significant non-cash transactions:
Accrued capital expenditures	295	261
Progress Energy
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	1,233	1,098
Net income (loss) (attributable to parent)	1,232	1,098
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,734	1,649
Equity component of AFUDC	(30)	(48)
(Gains) losses on sales of other assets	(9)
Impairment charges	1	(25)
Deferred income taxes	(3)	342
Contributions to qualified pension plans		(57)
Payments for asset retirement obligations	(287)	(309)
Provision for rate refunds	4	13
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(13)	9
Receivables	(207)	(128)
Receivables from affiliated companies	32	135
Inventory	46	45
Other current assets	214	79
Increase (decrease) in
Accounts payable	(124)	(64)
Accounts payable to affiliated companies	(102)	(6)
Taxes accrued	263	150
Other current liabilities	(41)	(96)
Other assets	(145)	(282)
Other liabilities	(102)	(75)
Net cash provided by operating activities	2,464	2,430
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(2,602)	(2,866)
Purchases of debt and equity securities	(4,554)	(1,304)
Proceeds from sales and maturities of debt and equity securities	4,543	1,300
Notes receivable from affiliated companies	164
Other	(114)	(130)
Net cash used in investing activities	(2,563)	(3,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,791	1,295
Payments for the redemption of long-term debt	(1,555)	(1,263)
Notes payable to affiliated companies	338	554
Distributions to parent	(400)
Other	(13)	8
Net cash provided by financing activities	161	594
Net increase (decrease) in cash, cash equivalents and restricted cash	62	24
Cash, cash equivalents and restricted cash at beginning of period	126	112
Cash, cash equivalents and restricted cash at end of period	188	136
Significant non-cash transactions:
Accrued capital expenditures	311	400
Duke Energy Progress
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	711	650
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	972	996
Equity component of AFUDC	(22)	(44)
(Gains) losses on sales of other assets	(8)
Impairment charges	5
Deferred income taxes	(33)	144
Contributions to qualified pension plans		(4)
Payments for asset retirement obligations	(249)	(288)
Provision for rate refunds	4	13
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(4)
Receivables	(34)	(9)
Receivables from affiliated companies	7	(11)
Inventory	24	15
Other current assets	82	65
Increase (decrease) in
Accounts payable	(185)	(54)
Accounts payable to affiliated companies	(59)	(80)
Taxes accrued	190	37
Other current liabilities	(24)	(17)
Other assets	(177)	(201)
Other liabilities	21	39
Net cash provided by operating activities	1,225	1,247
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,142)	(1,592)
Purchases of debt and equity securities	(1,269)	(656)
Proceeds from sales and maturities of debt and equity securities	1,238	632
Other	(31)	(56)
Net cash used in investing activities	(1,204)	(1,672)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,296	1,270
Payments for the redemption of long-term debt	(985)	(603)
Notes payable to affiliated companies	101	(215)
Distributions to parent	(400)
Other	(12)	(1)
Net cash provided by financing activities		451
Net increase (decrease) in cash, cash equivalents and restricted cash	21	26
Cash, cash equivalents and restricted cash at beginning of period	22	23
Cash, cash equivalents and restricted cash at end of period	43	49
Significant non-cash transactions:
Accrued capital expenditures	124	182
Duke Energy Florida
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	623	586
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	755	647
Equity component of AFUDC	(8)	(4)
Impairment charges	(4)	(25)
Deferred income taxes	19	164
Contributions to qualified pension plans		(53)
Payments for asset retirement obligations	(38)	(21)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(17)	9
Receivables	(172)	(119)
Receivables from affiliated companies	(3)	27
Inventory	22	29
Other current assets	41	100
Increase (decrease) in
Accounts payable	63	(11)
Accounts payable to affiliated companies	(54)	67
Taxes accrued	217	101
Other current liabilities	(20)	(77)
Other assets	48	(77)
Other liabilities	(136)	(123)
Net cash provided by operating activities	1,336	1,220
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,460)	(1,274)
Purchases of debt and equity securities	(3,284)	(648)
Proceeds from sales and maturities of debt and equity securities	3,305	668
Notes receivable from affiliated companies	173
Other	(82)	(73)
Net cash used in investing activities	(1,348)	(1,327)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	495	25
Payments for the redemption of long-term debt	(570)	(210)
Notes payable to affiliated companies	66	248
Other		9
Net cash provided by financing activities	(9)	72
Net increase (decrease) in cash, cash equivalents and restricted cash	(21)	(35)
Cash, cash equivalents and restricted cash at beginning of period	56	75
Cash, cash equivalents and restricted cash at end of period	35	40
Significant non-cash transactions:
Accrued capital expenditures	187	218
Duke Energy Ohio
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	201	190
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	211	202
Equity component of AFUDC	(4)	(9)
Deferred income taxes	31	68
Contributions to qualified pension plans		(2)
Payments for asset retirement obligations	(1)	(7)
Provision for rate refunds	10	5
(Increase) decrease in
Receivables	(5)	24
Receivables from affiliated companies	35	51
Inventory	5	(2)
Other current assets	5	(15)
Increase (decrease) in
Accounts payable	(28)	(40)
Accounts payable to affiliated companies	(14)	(9)
Taxes accrued	(23)	(40)
Other current liabilities	6	(4)
Other assets	(24)	(12)
Other liabilities	(7)	(22)
Net cash provided by operating activities	398	378
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(611)	(714)
Notes receivable from affiliated companies		(74)
Other	(34)	(45)
Net cash used in investing activities	(645)	(833)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	467	1,003
Payments for the redemption of long-term debt		(451)
Notes payable to affiliated companies	(227)	(107)
Net cash provided by financing activities	240	445
Net increase (decrease) in cash, cash equivalents and restricted cash	(7)	(10)
Cash, cash equivalents and restricted cash at beginning of period	17	21
Cash, cash equivalents and restricted cash at end of period	10	11
Significant non-cash transactions:
Accrued capital expenditures	92	100
Duke Energy Indiana
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	299	363
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	416	395
Equity component of AFUDC	(18)	(13)
Deferred income taxes	11	108
Contributions to qualified pension plans		(2)
Payments for asset retirement obligations	(48)	(31)
(Increase) decrease in
Receivables	15	1
Receivables from affiliated companies	(5)	37
Inventory	10	(56)
Other current assets	12	91
Increase (decrease) in
Accounts payable	(1)	1
Accounts payable to affiliated companies	(22)	(9)
Taxes accrued	65	(14)
Other current liabilities	(2)	(12)
Other assets	(41)	(75)
Other liabilities	104	67
Net cash provided by operating activities	795	851
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(669)	(663)
Purchases of debt and equity securities	(24)	(19)
Proceeds from sales and maturities of debt and equity securities	15	15
Notes receivable from affiliated companies		(213)
Other	(24)	(33)
Net cash used in investing activities	(702)	(913)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	544	485
Payments for the redemption of long-term debt	(500)	(60)
Notes payable to affiliated companies	53	(167)
Distributions to parent	(200)	(200)
Net cash provided by financing activities	(103)	58
Net increase (decrease) in cash, cash equivalents and restricted cash	(10)	(4)
Cash, cash equivalents and restricted cash at beginning of period	25	24
Cash, cash equivalents and restricted cash at end of period	15	20
Significant non-cash transactions:
Accrued capital expenditures	73	82
Piedmont Natural Gas
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	155	97
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	135	129
Equity in losses (earnings) of unconsolidated affiliates	(7)	(6)
Equity component of AFUDC	(14)
Impairment charges	7
Deferred income taxes	24	110
Contributions to qualified pension plans		(1)
Provision for rate refunds	(27)	9
(Increase) decrease in
Receivables	164	192
Receivables from affiliated companies	(1)	12
Inventory	25	23
Other current assets	(59)	(95)
Increase (decrease) in
Accounts payable	(53)	(93)
Accounts payable to affiliated companies	60	12
Taxes accrued	16	(51)
Other current liabilities	(4)	(6)
Other assets	(14)	(10)
Other liabilities	7	(5)
Net cash provided by operating activities	414	317
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(641)	(751)
Contributions to equity method investments		(16)
Other	(18)	(10)
Net cash used in investing activities	(659)	(777)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	394	596
Payments for the redemption of long-term debt		(350)
Notes payable to affiliated companies	(149)	64
Capital contributions from parent		150
Net cash provided by financing activities	245	460
Significant non-cash transactions:
Accrued capital expenditures	$ 123	$ 121