Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (2)	$ 1,641
Net income (loss) (attributable to parent)	136	1,732
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	2,651	2,483
Equity in losses (earnings) of unconsolidated affiliates	1,924	(87)
Equity component of AFUDC	(76)	(67)
(Gains) losses on sales of other assets	(8)
Impairment charges	8	4
Deferred income taxes	105	527
Payments for asset retirement obligations	(287)	(336)
Provision for rate refunds	(12)	57
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(24)	(11)
Receivables	281	304
Inventory	(56)	(110)
Other current assets	(124)	(265)
Increase (decrease) in
Accounts payable	(638)	(700)
Taxes accrued	273	(56)
Other current liabilities	(344)	(378)
Other assets	(193)	(1)
Other liabilities	(121)	51
Net cash provided by operating activities	3,357	3,056
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(5,103)	(5,465)
Contributions to equity method investments	(164)	(162)
Purchases of debt and equity securities	(3,818)	(2,316)
Proceeds from sales and maturities of debt and equity securities	3,755	2,302
Other	(141)	(147)
Net cash used in investing activities	(5,471)	(5,788)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3,788	4,622
Proceeds from the issuance of preferred stock		973
Proceeds from the issuance of common stock	57	27
Payments for the redemption of long-term debt	(1,951)	(2,155)
Proceeds from the issuance of short-term debt with original maturities greater than 90 days	1,866	240
Payments for the redemption of short-term debt with original maturities greater than 90 days	(113)	(299)
Notes payable and commercial paper	(129)	383
Contributions from noncontrolling interests	163	193
Dividends paid	(1,391)	(1,312)
Other	(108)	(50)
Net cash provided by financing activities	2,182	2,622
Net increase (decrease) in cash, cash equivalents and restricted cash	68	(110)
Cash, cash equivalents and restricted cash at beginning of period	573	591
Cash, cash equivalents and restricted cash at end of period	641	481
Significant non-cash transactions:
Accrued capital expenditures	945	917
Non-cash dividends	54	54
Duke Energy Carolinas
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	573	594
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	854	804
Equity component of AFUDC	(29)	(21)
Impairment charges	2	5
Deferred income taxes	31	54
Payments for asset retirement obligations	(86)	(131)
Provision for rate refunds	2	35
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(8)
Receivables	40	83
Receivables from affiliated companies	36	81
Inventory	(84)	(77)
Other current assets	170	(133)
Increase (decrease) in
Accounts payable	(249)	(282)
Accounts payable to affiliated companies	(63)	(41)
Taxes accrued	120	38
Other current liabilities	(134)	(71)
Other assets	(83)	87
Other liabilities	(35)	(18)
Net cash provided by operating activities	1,065	999
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,271)	(1,357)
Purchases of debt and equity securities	(1,017)	(1,114)
Proceeds from sales and maturities of debt and equity securities	1,017	1,114
Other	(73)	(46)
Net cash used in investing activities	(1,344)	(1,403)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	938	25
Payments for the redemption of long-term debt	(454)	(3)
Notes payable to affiliated companies	102	365
Distributions to parent	(300)
Other	(1)	(1)
Net cash provided by financing activities	285	386
Net increase (decrease) in cash, cash equivalents and restricted cash	6	(18)
Cash, cash equivalents and restricted cash at beginning of period	18	33
Cash, cash equivalents and restricted cash at end of period	24	15
Significant non-cash transactions:
Accrued capital expenditures	256	252
Progress Energy
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	627	577
Net income (loss) (attributable to parent)	627	577
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,118	1,061
Equity component of AFUDC	(24)	(31)
(Gains) losses on sales of other assets	(6)	1
Deferred income taxes	94	126
Payments for asset retirement obligations	(173)	(183)
Provision for rate refunds	2	10
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(22)	(1)
Receivables	(15)	(42)
Receivables from affiliated companies	34	119
Inventory	(42)	(26)
Other current assets	102	114
Increase (decrease) in
Accounts payable	(238)	(196)
Accounts payable to affiliated companies	(88)	(125)
Taxes accrued	155	82
Other current liabilities	(64)	(162)
Other assets	(51)	(82)
Other liabilities	(97)	24
Net cash provided by operating activities	1,312	1,266
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,812)	(1,988)
Purchases of debt and equity securities	(2,602)	(1,094)
Proceeds from sales and maturities of debt and equity securities	2,588	1,089
Notes receivable from affiliated companies	164
Other	(81)	(59)
Net cash used in investing activities	(1,743)	(2,052)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	514	1,295
Payments for the redemption of long-term debt	(550)	(1,188)
Notes payable to affiliated companies	552	685
Other		2
Net cash provided by financing activities	516	794
Net increase (decrease) in cash, cash equivalents and restricted cash	85	8
Cash, cash equivalents and restricted cash at beginning of period	126	112
Cash, cash equivalents and restricted cash at end of period	211	120
Significant non-cash transactions:
Accrued capital expenditures	287	278
Duke Energy Progress
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	365	372
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	635	634
Equity component of AFUDC	(19)	(28)
(Gains) losses on sales of other assets	(6)
Deferred income taxes	60	26
Payments for asset retirement obligations	(164)	(166)
Provision for rate refunds	2	10
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(5)	(5)
Receivables	96	58
Receivables from affiliated companies	10	(17)
Inventory	(46)	(26)
Other current assets	87	115
Increase (decrease) in
Accounts payable	(260)	(223)
Accounts payable to affiliated companies	(50)	(96)
Taxes accrued	71	53
Other current liabilities	(16)	(74)
Other assets	(86)	(3)
Other liabilities	(5)	25
Net cash provided by operating activities	669	655
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(795)	(1,115)
Purchases of debt and equity securities	(569)	(473)
Proceeds from sales and maturities of debt and equity securities	548	458
Other	(21)	(20)
Net cash used in investing activities	(837)	(1,150)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	20	1,270
Payments for the redemption of long-term debt	(13)	(602)
Notes payable to affiliated companies	191	(167)
Other	(1)	(1)
Net cash provided by financing activities	197	500
Net increase (decrease) in cash, cash equivalents and restricted cash	29	5
Cash, cash equivalents and restricted cash at beginning of period	22	23
Cash, cash equivalents and restricted cash at end of period	51	28
Significant non-cash transactions:
Accrued capital expenditures	95	112
Duke Energy Florida
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	336	297
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	478	423
Equity component of AFUDC	(6)	(2)
(Gains) losses on sales of other assets		1
Deferred income taxes	37	82
Payments for asset retirement obligations	(9)	(17)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(20)	2
Receivables	(110)	(101)
Receivables from affiliated companies	(2)	10
Inventory	4	1
Other current assets	(11)	8
Increase (decrease) in
Accounts payable	23	27
Accounts payable to affiliated companies	(51)	(29)
Taxes accrued	134	74
Other current liabilities	(50)	(80)
Other assets	37	(77)
Other liabilities	(91)	(8)
Net cash provided by operating activities	699	611
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,016)	(873)
Purchases of debt and equity securities	(2,033)	(621)
Proceeds from sales and maturities of debt and equity securities	2,040	631
Notes receivable from affiliated companies	173
Other	(60)	(37)
Net cash used in investing activities	(896)	(900)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	495	25
Payments for the redemption of long-term debt	(537)	(136)
Notes payable to affiliated companies	232	369
Other	2	3
Net cash provided by financing activities	192	261
Net increase (decrease) in cash, cash equivalents and restricted cash	(5)	(28)
Cash, cash equivalents and restricted cash at beginning of period	56	75
Cash, cash equivalents and restricted cash at end of period	51	47
Significant non-cash transactions:
Accrued capital expenditures	192	166
Duke Energy Ohio
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	131	116
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	138	132
Equity component of AFUDC	(2)	(7)
Deferred income taxes	24	45
Payments for asset retirement obligations		(5)
Provision for rate refunds	6	3
(Increase) decrease in
Receivables	2	24
Receivables from affiliated companies	45	64
Inventory	6	2
Other current assets	8	(13)
Increase (decrease) in
Accounts payable	(22)	(44)
Accounts payable to affiliated companies	(10)
Taxes accrued	(9)	(67)
Other current liabilities	2	2
Other assets	(24)	(18)
Other liabilities	(3)	(15)
Net cash provided by operating activities	292	219
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(403)	(473)
Notes receivable from affiliated companies	(35)
Other	(27)	(31)
Net cash used in investing activities	(465)	(504)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	397	794
Payments for the redemption of long-term debt		(451)
Notes payable to affiliated companies	(233)	(71)
Net cash provided by financing activities	164	272
Net increase (decrease) in cash, cash equivalents and restricted cash	(9)	(13)
Cash, cash equivalents and restricted cash at beginning of period	17	21
Cash, cash equivalents and restricted cash at end of period	8	8
Significant non-cash transactions:
Accrued capital expenditures	94	93
Duke Energy Indiana
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	180	207
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	267	265
Equity component of AFUDC	(12)	(9)
Deferred income taxes	38	60
Payments for asset retirement obligations	(28)	(17)
(Increase) decrease in
Receivables	19	5
Receivables from affiliated companies	20	39
Inventory	28	(41)
Other current assets	13	48
Increase (decrease) in
Accounts payable	22	26
Accounts payable to affiliated companies	(13)	(17)
Taxes accrued	4	(18)
Other current liabilities	(22)	(13)
Other assets	(29)	(33)
Other liabilities	(6)	15
Net cash provided by operating activities	481	517
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(456)	(443)
Purchases of debt and equity securities	(14)	(14)
Proceeds from sales and maturities of debt and equity securities	7	11
Notes receivable from affiliated companies	(425)
Other	(16)	(21)
Net cash used in investing activities	(904)	(467)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	544
Payments for the redemption of long-term debt		(60)
Notes payable to affiliated companies	(30)	(2)
Distributions to parent	(100)
Net cash provided by financing activities	414	(62)
Net increase (decrease) in cash, cash equivalents and restricted cash	(9)	(12)
Cash, cash equivalents and restricted cash at beginning of period	25	24
Cash, cash equivalents and restricted cash at end of period	16	12
Significant non-cash transactions:
Accrued capital expenditures	83	84
Piedmont Natural Gas
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	180	115
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	89	85
Equity in losses (earnings) of unconsolidated affiliates	(4)	(4)
Equity component of AFUDC	(9)
Deferred income taxes	17	40
Provision for rate refunds	(24)	9
(Increase) decrease in
Receivables	154	168
Receivables from affiliated companies	(4)	5
Inventory	42	37
Other current assets	(69)	(17)
Increase (decrease) in
Accounts payable	(68)	(70)
Accounts payable to affiliated companies	33	14
Taxes accrued	5	(61)
Other current liabilities	(4)	10
Other assets	(13)	(9)
Other liabilities	7	(2)
Net cash provided by operating activities	332	320
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(438)	(480)
Contributions to equity method investments		(16)
Notes receivable from affiliated companies		(16)
Other	(11)	(6)
Net cash used in investing activities	(449)	(518)
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	(277)	(198)
Capital contributions from parent		150
Net cash provided by financing activities	117	198
Significant non-cash transactions:
Accrued capital expenditures	$ 98	$ 115