Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 1,641	$ 1,124
Net income (attributable to parent)	1,720	1,120
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	2,483	2,250
Equity component of AFUDC	(67)	(106)
Losses on sales of other assets	0	97
Impairment charges	4	215
Deferred income taxes	527	289
Equity in earnings of unconsolidated affiliates	(87)	(12)
Accrued pension and other post-retirement benefit costs	4	31
Contributions to qualified pension plans		(141)
Payments for asset retirement obligations	(336)	(245)
Payment for disposal of other assets		(105)
Other rate case adjustments		37
Provision for rate refunds	57	281
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(11)	7
Receivables	304	(27)
Inventory	(110)	70
Other current assets	(265)	21
Increase (decrease) in
Accounts payable	(700)	(142)
Taxes accrued	(56)	(58)
Other current liabilities	(378)	(214)
Other assets	7	(112)
Other liabilities	39	42
Net cash provided by operating activities	3,056	3,302
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(5,465)	(4,375)
Contributions to equity method investments	(162)	(140)
Purchases of debt and equity securities	(2,316)	(1,908)
Proceeds from sales and maturities of debt and equity securities	2,302	1,866
Other	(147)	(88)
Net cash used in investing activities	(5,788)	(4,645)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	4,622	2,727
Proceeds from the issuance of preferred stock	973
Proceeds from the issuance of common stock	27	820
Payments for the redemption of long-term debt	(2,155)	(2,190)
Proceeds from the issuance of short-term debt with original maturities greater than 90 days	240	201
Payments for the redemption of short-term debt with original maturities greater than 90 days	(299)	(160)
Notes payable and commercial paper	383	1,090
Dividends paid	(1,312)	(1,199)
Other	143	(24)
Net cash provided by financing activities	2,622	1,265
Net decrease in cash, cash equivalents and restricted cash	(110)	(78)
Cash, cash equivalents and restricted cash at beginning of period	591	505
Cash, cash equivalents and restricted cash at end of period	481	427
Cash and cash equivalents at beginning of period	442
Cash and cash equivalents at end of period	336
Significant non-cash transactions:
Accrued capital expenditures	917	978
Non-cash dividends	54	52
Duke Energy Carolinas [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (attributable to parent)	594	440
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	804	707
Equity component of AFUDC	(21)	(39)
Losses on sales of other assets		1
Impairment charges	5	190
Deferred income taxes	54	90
Accrued pension and other post-retirement benefit costs	(4)	2
Contributions to qualified pension plans		(46)
Payments for asset retirement obligations	(131)	(114)
Provision for rate refunds	35	121
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(8)	8
Receivables	83	(33)
Receivable from affiliated companies	81	(22)
Inventory	(77)	(16)
Other current assets	(133)	(33)
Increase (decrease) in
Accounts payable	(282)	(59)
Accounts payable to affiliated companies	(41)	(51)
Taxes accrued	38	(78)
Other current liabilities	(71)	(123)
Other assets	91	(6)
Other liabilities	(18)	(29)
Net cash provided by operating activities	999	910
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,357)	(1,270)
Purchases of debt and equity securities	(1,114)	(976)
Proceeds from sales and maturities of debt and equity securities	1,114	976
Other	(46)	(64)
Net cash used in investing activities	(1,403)	(1,334)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	25	991
Payments for the redemption of long-term debt	(3)	(702)
Notes payable to affiliated companies	365	636
Distributions to parent		(500)
Other	(1)	(1)
Net cash provided by financing activities	386	424
Net increase (decrease) in cash and cash equivalents	(18)
Cash and cash equivalents at beginning of period	33	16
Cash and cash equivalents at end of period	15	16
Significant non-cash transactions:
Accrued capital expenditures	252	343
Progress Energy [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	577	504
Net income (attributable to parent)	577	500
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,061	945
Equity component of AFUDC	(31)	(52)
Losses on sales of other assets	1	(12)
Impairment charges		33
Deferred income taxes	126	240
Accrued pension and other post-retirement benefit costs	8	12
Contributions to qualified pension plans		(45)
Payments for asset retirement obligations	(183)	(108)
Other rate case adjustments		37
Provision for rate refunds	10	65
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(1)	14
Receivables	(42)	(196)
Receivable from affiliated companies	119	28
Inventory	(26)	71
Other current assets	114	(214)
Increase (decrease) in
Accounts payable	(196)	15
Accounts payable to affiliated companies	(125)	(19)
Taxes accrued	82	80
Other current liabilities	(162)	(58)
Other assets	(83)	(186)
Other liabilities	17	4
Net cash provided by operating activities	1,266	1,158
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,988)	(1,727)
Purchases of debt and equity securities	(1,094)	(812)
Proceeds from sales and maturities of debt and equity securities	1,089	820
Notes receivable from affiliated companies		(69)
Other	(59)	(81)
Net cash used in investing activities	(2,052)	(1,869)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,295	989
Payments for the redemption of long-term debt	(1,188)	(635)
Notes payable to affiliated companies	685	347
Other	2	(3)
Net cash provided by financing activities	794	698
Net decrease in cash, cash equivalents and restricted cash	8	(13)
Cash, cash equivalents and restricted cash at beginning of period	112	87
Cash, cash equivalents and restricted cash at end of period	120	74
Cash and cash equivalents at beginning of period	67
Cash and cash equivalents at end of period	51
Significant non-cash transactions:
Accrued capital expenditures	278	366
Duke Energy Progress [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (attributable to parent)	372	316
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	634	565
Equity component of AFUDC	(28)	(26)
Losses on sales of other assets		(2)
Impairment charges		33
Deferred income taxes	26	53
Accrued pension and other post-retirement benefit costs	1	7
Contributions to qualified pension plans		(25)
Payments for asset retirement obligations	(166)	(89)
Other rate case adjustments		37
Provision for rate refunds	10	65
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(5)	6
Receivables	58	(104)
Receivable from affiliated companies	(17)	2
Inventory	(26)	41
Other current assets	115	(111)
Increase (decrease) in
Accounts payable	(223)	(17)
Accounts payable to affiliated companies	(96)	(4)
Taxes accrued	53	26
Other current liabilities	(74)	(38)
Other assets		10
Other liabilities	21	13
Net cash provided by operating activities	655	758
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,115)	(996)
Purchases of debt and equity securities	(473)	(573)
Proceeds from sales and maturities of debt and equity securities	458	556
Other	(20)	(45)
Net cash used in investing activities	(1,150)	(1,058)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,270
Payments for the redemption of long-term debt	(602)
Notes payable to affiliated companies	(167)	300
Other	(1)	(2)
Net cash provided by financing activities	500	298
Net increase (decrease) in cash and cash equivalents	5	(2)
Cash and cash equivalents at beginning of period	23	20
Cash and cash equivalents at end of period	28	18
Significant non-cash transactions:
Accrued capital expenditures	112	172
Duke Energy Florida [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (attributable to parent)	297	271
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	423	374
Equity component of AFUDC	(2)	(26)
Losses on sales of other assets	1
Deferred income taxes	82	206
Accrued pension and other post-retirement benefit costs	5	3
Contributions to qualified pension plans		(20)
Payments for asset retirement obligations	(17)	(19)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	2	6
Receivables	(101)	(92)
Receivable from affiliated companies	10	(4)
Inventory	1	28
Other current assets	8	(114)
Increase (decrease) in
Accounts payable	27	34
Accounts payable to affiliated companies	(29)	(11)
Taxes accrued	74	81
Other current liabilities	(80)	(21)
Other assets	(81)	(196)
Other liabilities	(9)	(10)
Net cash provided by operating activities	611	490
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(873)	(731)
Purchases of debt and equity securities	(621)	(239)
Proceeds from sales and maturities of debt and equity securities	631	264
Notes receivable from affiliated companies		(110)
Other	(37)	(35)
Net cash used in investing activities	(900)	(851)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	25	989
Payments for the redemption of long-term debt	(136)	(635)
Notes payable to affiliated companies	369
Other	3	(1)
Net cash provided by financing activities	261	353
Net decrease in cash, cash equivalents and restricted cash	(28)	(8)
Cash, cash equivalents and restricted cash at beginning of period	75	53
Cash, cash equivalents and restricted cash at end of period	47	45
Cash and cash equivalents at beginning of period	36
Cash and cash equivalents at end of period	16
Significant non-cash transactions:
Accrued capital expenditures	166	194
Duke Energy Ohio [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (attributable to parent)	116	21
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	132	134
Equity component of AFUDC	(7)	(8)
Losses on sales of other assets		106
Deferred income taxes	45	(2)
Accrued pension and other post-retirement benefit costs		2
Payments for asset retirement obligations	(5)	(2)
Provision for rate refunds	3	19
(Increase) decrease in
Receivables	24	(7)
Receivable from affiliated companies	64	62
Inventory	2	9
Other current assets	(13)	24
Increase (decrease) in
Accounts payable	(44)	(34)
Accounts payable to affiliated companies		(15)
Taxes accrued	(67)	(63)
Other current liabilities	2	8
Other assets	(18)	(7)
Other liabilities	(15)	(18)
Net cash provided by operating activities	219	229
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(473)	(392)
Notes receivable from affiliated companies		14
Other	(31)	(43)
Net cash used in investing activities	(504)	(421)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	794
Payments for the redemption of long-term debt	(451)	(3)
Notes payable to affiliated companies	(71)	190
Net cash provided by financing activities	272	187
Net increase (decrease) in cash and cash equivalents	(13)	(5)
Cash and cash equivalents at beginning of period	21	12
Cash and cash equivalents at end of period	8	7
Significant non-cash transactions:
Accrued capital expenditures	93	70
Non-cash equity contribution from parent		106
Duke Energy Indiana [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (attributable to parent)	207	198
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	265	258
Equity component of AFUDC	(9)	(7)
Deferred income taxes	60	36
Accrued pension and other post-retirement benefit costs	2	3
Contributions to qualified pension plans		(8)
Payments for asset retirement obligations	(17)	(21)
Provision for rate refunds		49
(Increase) decrease in
Receivables	5	2
Receivable from affiliated companies	39	36
Inventory	(41)	(20)
Other current assets	48	(35)
Increase (decrease) in
Accounts payable	26	33
Accounts payable to affiliated companies	(17)	(19)
Taxes accrued	(18)	(41)
Other current liabilities	(13)	3
Other assets	(34)	20
Other liabilities	14	(21)
Net cash provided by operating activities	517	466
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(443)	(416)
Purchases of debt and equity securities	(14)	(34)
Proceeds from sales and maturities of debt and equity securities	11	13
Other	(21)	2
Net cash used in investing activities	(467)	(435)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments for the redemption of long-term debt	(60)
Notes payable to affiliated companies	(2)	60
Distributions to parent		(75)
Other		(1)
Net cash provided by financing activities	(62)	(16)
Net increase (decrease) in cash and cash equivalents	(12)	15
Cash and cash equivalents at beginning of period	24	9
Cash and cash equivalents at end of period	12	24
Significant non-cash transactions:
Accrued capital expenditures	84	62
Piedmont Natural Gas [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (attributable to parent)	115	102
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	85	79
Deferred income taxes	40	4
Equity in earnings of unconsolidated affiliates	(4)	(3)
Accrued pension and other post-retirement benefit costs	(5)	(2)
Provision for rate refunds	9	27
(Increase) decrease in
Receivables	168	166
Receivable from affiliated companies	5	(4)
Inventory	37	28
Other current assets	(17)	74
Increase (decrease) in
Accounts payable	(70)	(32)
Accounts payable to affiliated companies	14	(12)
Taxes accrued	(61)	4
Other current liabilities	10	28
Other assets	(5)	2
Other liabilities	(1)	(2)
Net cash provided by operating activities	320	459
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(480)	(327)
Contributions to equity method investments	(16)
Notes receivable from affiliated companies	(16)	(77)
Other	(6)	(2)
Net cash used in investing activities	(518)	(406)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	596
Payments for the redemption of long-term debt	(350)
Notes payable to affiliated companies	(198)	(364)
Capital contributions from parent	150	300
Net cash provided by financing activities	198	(64)
Net increase (decrease) in cash and cash equivalents		(11)
Cash and cash equivalents at beginning of period		19
Cash and cash equivalents at end of period		8
Significant non-cash transactions:
Accrued capital expenditures	$ 115	$ 73