Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]
Net Income (Loss)	$ 2,170	$ 2,831	$ 1,889
Net Income (Loss) Attributable to Parent	2,152	2,816	1,883
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Depreciation, amortization and accretion (including amortization of nuclear fuel)	3,880	3,613	3,507
Equity component of AFUDC	(200)	(164)	(135)
FERC mitigation costs			(15)
Accrued charitable contributions related to Piedmont commitments	93
Losses (gains) on sales of other assets	477	(48)	(33)
Impairment charges	212	153	915
Deferred income taxes	900	1,244	1,149
Equity in earnings of unconsolidated affiliates	15	(69)	(130)
Accrued pension and other post-retirement benefit costs	21	71	108
Contributions to qualified pension plans	(155)	(302)
Payments for asset retirement obligations	(608)	(346)	(68)
(Increase) decrease in [Abstract]
Net realized and unrealized mark-to-market and hedging transactions	34	(29)	44
Receivables	(391)	359	58
Inventory	272	(237)	(269)
Other current assets	(220)	(65)	(414)
Increase (decrease) in [Abstract]
Accounts payable	266	(6)	(30)
Taxes accrued	236	(38)	(14)
Other current liabilities	182	168	(201)
Other assets	(186)	(216)	16
Other liabilities	(200)	(243)	209
Net cash provided by operating activities	6,798	6,676	6,586
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]
Capital expenditures	(7,901)	(6,766)	(5,384)
Investment expenditures	(307)	(263)	(90)
Acquisitions, net of cash acquired	(4,778)	(1,334)	(54)
Purchases of available-for-sale securities	(5,153)	(4,037)	(4,110)
Proceeds from sales and maturities of available-for-sale securities	5,236	4,040	4,133
Proceeds from the sales of discontinued operations and other assets, net of cash divested	1,418	2,968	179
Change in Restricted Cash	(4)	191	9
Other	(44)	(76)	(56)
Net cash used in investing activities	(11,533)	(5,277)	(5,373)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]
Proceeds from the issuance of long-term debt	9,238	2,955	2,914
Proceeds from Issuance of Common Stock	731
Proceeds from the issuance of common stock		17	25
Payments for the redemption of long-term debt	(1,923)	(3,029)	(3,037)
Proceeds from issuance of short-term debt with original maturities greater than 90 days	2,081	379	1,066
Payments for the redemption of short-term debt with original maturities greater than 90 days	(2,166)	(931)	(564)
Notes payable and commercial paper	(1,362)	1,797	1,186
Distributions to noncontrolling interests	(6)	(9)	(65)
Dividends paid	(2,332)	(2,254)	(2,234)
Repurchase of common shares		(1,500)
Other	9	(3)	31
Net cash provided by (used in) financing activities	4,270	(2,578)	(678)
Changes in Cash and Cash Equivalents included in asses held for sale	474	1,099	(548)
Net increase (decrease) in cash and cash equivalents	9	(80)	(13)
Cash and cash equivalents at beginning of period	383	463	476
Cash and cash equivalents at end of period	392	383	463
Supplemental Disclosures [Abstract]
Cash paid for interest, net of amount capitalized	1,794	1,607	1,659
Cash paid for (received from) income taxes	229	170	158
Significant Non-cash Transactions [Abstract]
Accrued capital expenditures	1,000	771	664
Duke Energy Carolinas [Member]
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]
Net Income (Loss) Attributable to Parent	1,166	1,081	1,072
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,382	1,361	1,273
Equity component of AFUDC	(102)	(96)	(91)
FERC mitigation costs			3
Accrued charitable contributions related to Piedmont commitments	52
Losses (gains) on sales of other assets	5	1
Impairment charges	1	1
Deferred income taxes	470	397	376
Accrued pension and other post-retirement benefit costs	4	15	22
Contributions to qualified pension plans	(43)	(91)
Payments for asset retirement obligations	(287)	(167)
(Increase) decrease in [Abstract]
Net realized and unrealized mark-to-market and hedging transactions	5
Receivables	(76)	42	48
Receivables from affiliated companies	(56)	(32)
Inventory	215	(157)	(60)
Other current assets	67	(51)	(236)
Increase (decrease) in [Abstract]
Accounts payable	(85)	(4)	10
Accounts payable to affiliated companies	18	75	(7)
Taxes accrued	187	(128)	(15)
Other current liabilities	63	127	(10)
Other assets	20	76	17
Other liabilities	(30)	(77)	(22)
Net cash provided by operating activities	2,976	2,373	2,380
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]
Capital expenditures	(2,220)	(1,933)	(1,879)
Purchases of available-for-sale securities	(2,832)	(2,555)	(2,064)
Proceeds from sales and maturities of available-for-sale securities	2,832	2,555	2,044
Notes receivable from affiliated companies		(13)
Notes receivable from affiliated companies	97		72
Other	(83)	(35)	(18)
Net cash used in investing activities	(2,206)	(1,981)	(1,845)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]
Proceeds from the issuance of long-term debt	1,587	516
Payments for the redemption of long-term debt	(356)	(506)	(45)
Distributions to parent	(2,000)	(401)	(500)
Other		(1)
Net cash provided by (used in) financing activities	(769)	(392)	(545)
Net increase (decrease) in cash and cash equivalents	1		(10)
Cash and cash equivalents at beginning of period	13	13	23
Cash and cash equivalents at end of period	14	13	13
Supplemental Disclosures [Abstract]
Cash paid for interest, net of amount capitalized	393	389	388
Cash paid for (received from) income taxes	(60)	342	305
Significant Non-cash Transactions [Abstract]
Accrued capital expenditures	347	239	194
Progress Energy [Member]
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]
Net Income (Loss)	1,041	1,062	874
Net Income (Loss) Attributable to Parent	1,031	1,051	869
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,435	1,312	1,313
Equity component of AFUDC	(76)	(54)	(26)
FERC mitigation costs			(18)
Accrued charitable contributions related to Piedmont commitments	32
Losses (gains) on sales of other assets	(34)	(31)	(6)
Impairment charges	7	12	2
Deferred income taxes	532	714	1,014
Accrued pension and other post-retirement benefit costs	(24)	(5)	27
Contributions to qualified pension plans	(43)	(83)
Payments for asset retirement obligations	(270)	(156)	(68)
(Increase) decrease in [Abstract]
Net realized and unrealized mark-to-market and hedging transactions	42	(6)	12
Receivables	7	105	(31)
Receivables from affiliated companies	211	(316)	(56)
Inventory	35	(67)	(101)
Other current assets	3	553	(934)
Increase (decrease) in [Abstract]
Accounts payable	242	(193)	6
Accounts payable to affiliated companies	37	108	80
Taxes accrued	15	(63)	(20)
Other current liabilities	(42)	136	(144)
Other assets	(248)	(167)	(14)
Other liabilities	(58)	(112)	56
Net cash provided by operating activities	2,844	2,749	1,966
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]
Capital expenditures	(3,306)	(2,698)	(1,940)
Acquisitions	(10)	(1,249)
Purchases of available-for-sale securities	(2,143)	(1,174)	(1,689)
Proceeds from sales and maturities of available-for-sale securities	2,187	1,211	1,652
Proceeds from Insurance	58
Proceeds from the sale of nuclear fuel	20	102
Notes receivable from affiliated companies	(80)		(145)
Notes receivable from affiliated companies		220
Change in Restricted Cash	(6)
Other	47	(34)	(44)
Net cash used in investing activities	(3,233)	(3,622)	(2,166)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]
Proceeds from the issuance of long-term debt	2,375	1,186	1,572
Payments for the redemption of long-term debt	(327)	(1,553)	(931)
Notes payable to affiliated companies	444	623	(378)
Distributions to noncontrolling interests	(1)	(4)	(37)
Capital contribution from parent		625
Dividends to parent	(2,098)
Other	(2)	(2)	(42)
Net cash provided by (used in) financing activities	391	875	184
Net increase (decrease) in cash and cash equivalents	2	2	(16)
Cash and cash equivalents at beginning of period	44	42	58
Cash and cash equivalents at end of period	46	44	42
Supplemental Disclosures [Abstract]
Cash paid for interest, net of amount capitalized	673	649	664
Cash paid for (received from) income taxes	(187)	(426)	141
Significant Non-cash Transactions [Abstract]
Accrued capital expenditures	317	329	294
Duke Energy Progress [Member]
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]
Net Income (Loss) Attributable to Parent	599	566	467
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Depreciation, amortization and accretion (including amortization of nuclear fuel)	907	821	761
Equity component of AFUDC	(50)	(47)	(25)
FERC mitigation costs			(18)
Accrued charitable contributions related to Piedmont commitments	32
Losses (gains) on sales of other assets	(6)	(7)	(3)
Impairment charges	1	5
Deferred income taxes	384	354	455
Accrued pension and other post-retirement benefit costs	(32)	(14)	(7)
Contributions to qualified pension plans	(24)	(42)
Payments for asset retirement obligations	(212)	(109)
(Increase) decrease in [Abstract]
Net realized and unrealized mark-to-market and hedging transactions	4	(3)	13
Receivables	(17)	43	78
Receivables from affiliated companies	11	(6)	(8)
Inventory	12	(50)	(65)
Other current assets	84	185	(416)
Increase (decrease) in [Abstract]
Accounts payable	171	(65)	27
Accounts payable to affiliated companies	37	70	17
Taxes accrued	90	(34)	10
Other current liabilities	114	76	(68)
Other assets	(163)	(83)	48
Other liabilities	(10)	(66)	(21)
Net cash provided by operating activities	1,932	1,594	1,245
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]
Capital expenditures	(1,733)	(1,669)	(1,241)
Acquisitions		(1,249)
Purchases of available-for-sale securities	(1,658)	(727)	(499)
Proceeds from sales and maturities of available-for-sale securities	1,615	672	458
Notes receivable from affiliated companies	(165)		(237)
Notes receivable from affiliated companies		237
Other	26	(30)	(12)
Net cash used in investing activities	(1,915)	(2,766)	(1,531)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]
Proceeds from the issuance of long-term debt	505	1,186	1,347
Payments for the redemption of long-term debt	(15)	(991)	(379)
Notes payable to affiliated companies	(209)	359	(462)
Capital contribution from parent		626
Dividends to parent			(225)
Distributions to parent	(300)
Other	(2)	(2)	(7)
Net cash provided by (used in) financing activities	(21)	1,178	274
Net increase (decrease) in cash and cash equivalents	(4)	6	(12)
Cash and cash equivalents at beginning of period	15	9	21
Cash and cash equivalents at end of period	11	15	9
Supplemental Disclosures [Abstract]
Cash paid for interest, net of amount capitalized	248	218	220
Cash paid for (received from) income taxes	(287)	(197)	81
Significant Non-cash Transactions [Abstract]
Accrued capital expenditures	147	143	194
Duke Energy Florida [Member]
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]
Net Income (Loss) Attributable to Parent	551	599	548
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Depreciation, amortization and accretion (including amortization of nuclear fuel)	516	480	550
Equity component of AFUDC	(26)	(7)
Losses (gains) on sales of other assets			(1)
Impairment charges	6	7	2
Deferred income taxes	224	348	400
Accrued pension and other post-retirement benefit costs	2	5	29
Contributions to qualified pension plans	(20)	(40)
Payments for asset retirement obligations	(58)	(47)	(68)
(Increase) decrease in [Abstract]
Net realized and unrealized mark-to-market and hedging transactions	38	(3)	(9)
Receivables	23	61	(33)
Receivables from affiliated companies	21	(44)	(37)
Inventory	23	(17)	(36)
Other current assets	(133)	116	(269)
Increase (decrease) in [Abstract]
Accounts payable	71	(127)	18
Accounts payable to affiliated companies	9	46	32
Taxes accrued	(117)	67	(31)
Other current liabilities	(149)	57	(80)
Other assets	(84)	(84)	(59)
Other liabilities	(53)	(44)	10
Net cash provided by operating activities	844	1,373	966
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]
Capital expenditures	(1,573)	(1,029)	(699)
Acquisitions	(10)
Purchases of available-for-sale securities	(485)	(447)	(1,189)
Proceeds from sales and maturities of available-for-sale securities	572	538	1,195
Proceeds from Insurance	58
Proceeds from the sale of nuclear fuel	20	102
Change in Restricted Cash	(6)
Other	21	(3)	(31)
Net cash used in investing activities	(1,403)	(839)	(724)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]
Proceeds from the issuance of long-term debt	1,870		225
Payments for the redemption of long-term debt	(12)	(562)	(252)
Notes payable to affiliated companies	(516)	729	(97)
Dividends to parent		(350)	(124)
Distributions to parent	(775)	(350)
Other		(1)	(2)
Net cash provided by (used in) financing activities	567	(534)	(250)
Net increase (decrease) in cash and cash equivalents	8		(8)
Cash and cash equivalents at beginning of period	8	8	16
Cash and cash equivalents at end of period	16	8	8
Supplemental Disclosures [Abstract]
Cash paid for interest, net of amount capitalized	208	205	203
Cash paid for (received from) income taxes	216	(229)	59
Significant Non-cash Transactions [Abstract]
Accrued capital expenditures	170	186	100
Duke Energy Ohio [Member]
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]
Net Income (Loss) Attributable to Parent	228	172	(495)
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Depreciation, amortization and accretion (including amortization of nuclear fuel)	237	230	258
Equity component of AFUDC	(6)	(3)	(4)
Losses (gains) on sales of other assets	(2)	(8)	(1)
Impairment charges		40	941
Deferred income taxes	55	206	(219)
Accrued pension and other post-retirement benefit costs	6	9	8
Contributions to qualified pension plans	(5)	(8)
Payments for asset retirement obligations	(5)	(4)
(Increase) decrease in [Abstract]
Net realized and unrealized mark-to-market and hedging transactions	(2)	(10)	27
Receivables	(4)	23	(56)
Receivables from affiliated companies	(36)	23	14
Inventory	(32)		8
Other current assets	79		(5)
Increase (decrease) in [Abstract]
Accounts payable	19	(1)	27
Accounts payable to affiliated companies	10	(21)	(3)
Taxes accrued	3	(21)	(9)
Other current liabilities	(54)	88	27
Other assets	(35)	25	(4)
Other liabilities	(31)	(73)	(33)
Net cash provided by operating activities	425	667	481
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]
Capital expenditures	(476)	(399)	(322)
Notes receivable from affiliated companies	(94)		(88)
Notes receivable from affiliated companies		145
Other	(30)	(15)	(12)
Net cash used in investing activities	(600)	(269)	(422)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]
Proceeds from the issuance of long-term debt	341
Payments for the redemption of long-term debt	(53)	(157)	(449)
Notes payable to affiliated companies	(87)	(95)	473
Capital contribution from parent	9
Dividends to parent	(25)	(150)	(100)
Other	(2)	(2)	1
Net cash provided by (used in) financing activities	174	(404)	(75)
Net increase (decrease) in cash and cash equivalents	(1)	(6)	(16)
Cash and cash equivalents at beginning of period	14	20	36
Cash and cash equivalents at end of period	13	14	20
Supplemental Disclosures [Abstract]
Cash paid for interest, net of amount capitalized	81	76	76
Cash paid for (received from) income taxes	(46)	410	(5)
Significant Non-cash Transactions [Abstract]
Accrued capital expenditures	83	20	24
Distribution of membership interest of Duke Energy SAM, LLC to parent		1,912
Duke Energy Indiana [Member]
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]
Net Income (Loss) Attributable to Parent	381	316	359
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Depreciation, amortization and accretion (including amortization of nuclear fuel)	499	439	416
Equity component of AFUDC	(16)	(11)	(14)
Losses (gains) on sales of other assets		(1)
Impairment charges	8	88
Deferred income taxes	213	262	308
Accrued pension and other post-retirement benefit costs	8	13	16
Contributions to qualified pension plans	(9)	(19)
Payments for asset retirement obligations	(46)	(19)
(Increase) decrease in [Abstract]
Receivables	(2)	(7)	(35)
Receivables from affiliated companies	(43)	44	36
Inventory	66	(21)	(103)
Other current assets	(67)	90	(8)
Increase (decrease) in [Abstract]
Accounts payable	8	33	(41)
Accounts payable to affiliated companies	(9)	25	2
Taxes accrued	(4)	35	(32)
Other current liabilities	(81)	26	5
Other assets	(27)	(82)	(21)
Other liabilities	(8)	(35)	17
Net cash provided by operating activities	871	1,176	905
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]
Capital expenditures	(755)	(690)	(625)
Purchases of available-for-sale securities	(14)	(9)	(20)
Proceeds from sales and maturities of available-for-sale securities	11	11	16
Proceeds from the sales of discontinued operations and other assets, net of cash divested		17
Notes receivable from affiliated companies	(3)	(83)
Notes receivable from affiliated companies			96
Other	32	(17)	4
Net cash used in investing activities	(729)	(771)	(529)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]
Proceeds from the issuance of long-term debt	494
Payments for the redemption of long-term debt	(478)	(5)	(5)
Notes payable to affiliated companies		(71)	71
Dividends to parent		(326)	(450)
Distributions to parent	(149)
Other	(1)		(1)
Net cash provided by (used in) financing activities	(134)	(402)	(385)
Net increase (decrease) in cash and cash equivalents	8	3	(9)
Cash and cash equivalents at beginning of period	9	6	15
Cash and cash equivalents at end of period	17	9	6
Supplemental Disclosures [Abstract]
Cash paid for interest, net of amount capitalized	171	175	169
Cash paid for (received from) income taxes	(7)	(253)	(61)
Significant Non-cash Transactions [Abstract]
Accrued capital expenditures	$ 99	$ 64	$ 87