Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 2,392	$ 2,349
Net Income Attributable to Parent	2,379	2,339
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	2,847	2,680
Equity component of AFUDC	(140)	(123)
(Gains) Losses on sales of other assets	(27)	(44)
Impairment charges	279	145
Deferred income taxes	648	1,104
Equity in earnings of unconsolidated affiliates	(34)	(53)
Accrued pension and other post-retirement benefit costs	12	53
Contributions to qualified pension plans		(143)
Payments for asset retirement obligations	(443)	(208)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	36	(23)
Receivables	(295)	67
Inventory	455	(13)
Other current assets	(163)	(119)
Increase (decrease) in
Accounts payable	(207)	(182)
Taxes accrued	417	41
Other current liabilities	(157)	79
Other assets	(64)	(143)
Other liabilities	36	(71)
Net cash provided by operating activities	5,592	5,396
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(5,242)	(4,642)
Investment expenditures	(198)	(209)
Acquisitions	(10)	(1,317)
Purchases of available-for-sale securities	(4,048)	(3,017)
Proceeds from sales and maturities of available-for-sale securities	4,107	3,037
Net proceeds from the sale of the Midwest Generation Disposal Group		2,792
Net proceeds from the sales of equity investments and other assets	6	124
Change in restricted cash	(34)	(49)
Other	(136)	(10)
Net cash used in investing activities	(5,555)	(3,291)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	8,647	1,780
Proceeds from the issuance of common stock related to employee benefit plans	7	16
Payments for the redemption of long-term debt	(988)	(1,264)
Proceeds from issuance of short-term debt with original maturities greater than 90 days	1,424	287
Payments for the redemption of short-term debt with original maturities greater than 90 days	(492)	(931)
Notes payable and commercial paper	(1,579)	531
Distributions to noncontrolling interests	(3)	(7)
Dividends paid	(1,731)	(1,685)
Repurchase of common shares		(1,500)
Other		2
Net cash provided by (used in) financing activities	5,285	(2,771)
Net increase (decrease) in cash and cash equivalents	5,322	(666)
Cash and cash equivalents at beginning of period	857	2,036
Cash and cash equivalents at end of period	6,179	1,370
Significant non-cash transactions:
Accrued capital expenditures	631	610
Duke Energy Carolinas [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income Attributable to Parent	1,026	940
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,020	1,016
Equity component of AFUDC	(75)	(73)
(Gains) Losses on sales of other assets	1
Deferred income taxes	382	183
Accrued pension and other post-retirement benefit costs	3	11
Contributions to qualified pension plans		(42)
Payments for asset retirement obligations	(204)	(104)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	4
Receivables	(191)	(9)
Receivable from affiliated companies	19
Inventory	217	(48)
Other current assets	81	42
Increase (decrease) in
Accounts payable	(179)	(141)
Accounts payable to affiliated companies	(100)	(11)
Taxes accrued	248	182
Other current liabilities	51	49
Other assets	57	97
Other liabilities	(15)	(61)
Net cash provided by operating activities	2,345	2,031
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,531)	(1,372)
Purchases of available-for-sale securities	(2,070)	(1,926)
Proceeds from sales and maturities of available-for-sale securities	2,070	1,926
Notes receivable from affiliated companies payments		(549)
Notes receivable from affiliated companies	131
Other	(65)	(13)
Net cash used in investing activities	(1,465)	(1,934)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	992	496
Payments for the redemption of long-term debt	(3)	(3)
Distributions to parent	(1,800)	(401)
Other		(4)
Net cash provided by (used in) financing activities	(811)	88
Net increase (decrease) in cash and cash equivalents	69	185
Cash and cash equivalents at beginning of period	13	13
Cash and cash equivalents at end of period	82	198
Significant non-cash transactions:
Accrued capital expenditures	228	229
Progress Energy [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	935	931
Net Income Attributable to Parent	927	923
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,071	962
Equity component of AFUDC	(51)	(40)
(Gains) Losses on sales of other assets	(23)	(24)
Impairment charges	4	7
Deferred income taxes	425	512
Accrued pension and other post-retirement benefit costs	(19)	(4)
Contributions to qualified pension plans		(42)
Payments for asset retirement obligations	(203)	(90)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	33	6
Receivables	(155)	(103)
Receivable from affiliated companies	329	(62)
Inventory	99	44
Other current assets	(30)	298
Increase (decrease) in
Accounts payable	(24)	(157)
Accounts payable to affiliated companies	(109)	35
Taxes accrued	159	75
Other current liabilities	(156)	115
Other assets	(90)	(116)
Other liabilities	(4)	(87)
Net cash provided by operating activities	2,191	2,260
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(2,276)	(1,816)
Acquisitions	(10)	(1,249)
Purchases of available-for-sale securities	(1,849)	(829)
Proceeds from sales and maturities of available-for-sale securities	1,899	895
Proceeds from Insurance	58
Proceeds from the sale of nuclear fuel		81
Notes receivable from affiliated companies payments	(43)	(31)
Change in restricted cash	(6)
Other	(17)	(44)
Net cash used in investing activities	(2,244)	(2,993)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	2,375	1,195
Payments for the redemption of long-term debt	(327)	(555)
Notes payable to affiliated companies	(798)	(401)
Distributions to noncontrolling interests	(1)	(4)
Capital contribution from parent		625
Dividends to parent	(1,075)
Other		(11)
Net cash provided by (used in) financing activities	174	849
Net increase (decrease) in cash and cash equivalents	121	116
Cash and cash equivalents at beginning of period	44	42
Cash and cash equivalents at end of period	165	158
Significant non-cash transactions:
Accrued capital expenditures	228	276
Duke Energy Progress [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income Attributable to Parent	539	497
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	679	587
Equity component of AFUDC	(34)	(35)
(Gains) Losses on sales of other assets	(4)	(5)
Impairment charges	1
Deferred income taxes	325	308
Accrued pension and other post-retirement benefit costs	(24)	(11)
Contributions to qualified pension plans		(21)
Payments for asset retirement obligations	(163)	(53)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(3)
Receivables	(78)	(51)
Receivable from affiliated companies	11	4
Inventory	91	37
Other current assets	37	187
Increase (decrease) in
Accounts payable	(44)	(69)
Accounts payable to affiliated companies	(47)	21
Taxes accrued	76	34
Other current liabilities	37	22
Other assets	(32)	(41)
Other liabilities	(10)	(64)
Net cash provided by operating activities	1,360	1,344
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,106)	(1,120)
Acquisitions		(1,249)
Purchases of available-for-sale securities	(1,470)	(511)
Proceeds from sales and maturities of available-for-sale securities	1,448	488
Notes receivable from affiliated companies payments	(65)	(70)
Other	(27)	(35)
Net cash used in investing activities	(1,220)	(2,497)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	505	1,195
Payments for the redemption of long-term debt	(15)	(544)
Notes payable to affiliated companies	(209)
Capital contribution from parent		625
Distributions to parent	(301)
Other	1	(9)
Net cash provided by (used in) financing activities	(19)	1,267
Net increase (decrease) in cash and cash equivalents	121	114
Cash and cash equivalents at beginning of period	15	9
Cash and cash equivalents at end of period	136	123
Significant non-cash transactions:
Accrued capital expenditures	66	136
Duke Energy Florida [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income Attributable to Parent	487	494
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	383	373
Equity component of AFUDC	(16)	(4)
Impairment charges	4	7
Deferred income taxes	136	341
Accrued pension and other post-retirement benefit costs	2	4
Contributions to qualified pension plans		(21)
Payments for asset retirement obligations	(41)	(37)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	34	3
Receivables	(78)	(52)
Receivable from affiliated companies	41	(58)
Inventory	8	7
Other current assets	(32)	78
Increase (decrease) in
Accounts payable	20	(88)
Accounts payable to affiliated companies	(55)	10
Taxes accrued	61	43
Other current liabilities	(183)	97
Other assets	(56)	(73)
Other liabilities	1	(29)
Net cash provided by operating activities	716	1,095
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,169)	(696)
Acquisitions	(10)
Purchases of available-for-sale securities	(379)	(318)
Proceeds from sales and maturities of available-for-sale securities	450	408
Proceeds from Insurance	58
Proceeds from the sale of nuclear fuel		81
Change in restricted cash	(6)
Other	10	(12)
Net cash used in investing activities	(1,046)	(537)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,870
Payments for the redemption of long-term debt	(12)	(11)
Notes payable to affiliated companies	(750)	161
Dividends to parent		(350)
Distributions to parent	(774)	(350)
Other	(2)
Net cash provided by (used in) financing activities	332	(550)
Net increase (decrease) in cash and cash equivalents	2	8
Cash and cash equivalents at beginning of period	8	8
Cash and cash equivalents at end of period	10	16
Significant non-cash transactions:
Accrued capital expenditures	162	140
Duke Energy Ohio [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income Attributable to Parent	171	129
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	178	175
Equity component of AFUDC	(4)	(2)
(Gains) Losses on sales of other assets	(2)	(8)
Impairment charges		40
Deferred income taxes	36	127
Accrued pension and other post-retirement benefit costs	4	7
Contributions to qualified pension plans		(4)
Payments for asset retirement obligations	(4)	(2)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(11)
Receivables	(1)	8
Receivable from affiliated companies	(3)	46
Inventory	(5)	2
Other current assets	50	6
Increase (decrease) in
Accounts payable	13	7
Accounts payable to affiliated companies	(4)	(32)
Taxes accrued	(13)	(58)
Other current liabilities	(53)	101
Other assets	(8)	28
Other liabilities	(28)	(57)
Net cash provided by operating activities	327	502
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(334)	(266)
Notes receivable from affiliated companies payments	(47)
Notes receivable from affiliated companies		145
Other	(21)	(9)
Net cash used in investing activities	(402)	(130)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	341
Payments for the redemption of long-term debt	(53)	(153)
Notes payable to affiliated companies	(103)	(64)
Dividends to parent	(25)	(149)
Other		(2)
Net cash provided by (used in) financing activities	160	(368)
Net increase (decrease) in cash and cash equivalents	85	4
Cash and cash equivalents at beginning of period	14	20
Cash and cash equivalents at end of period	99	24
Significant non-cash transactions:
Accrued capital expenditures	56	24
Distribution of membership interest of Duke Energy SAM, LLC to parent		1,912
Duke Energy Indiana [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income Attributable to Parent	309	222
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	347	323
Equity component of AFUDC	(11)	(9)
Impairment charges	8	85
Deferred income taxes	122	276
Accrued pension and other post-retirement benefit costs	6	10
Contributions to qualified pension plans		(9)
Payments for asset retirement obligations	(31)	(12)
(Increase) decrease in
Receivables	16	(5)
Receivable from affiliated companies	(3)	43
Inventory	146	(27)
Other current assets	(105)	67
Increase (decrease) in
Accounts payable	(14)	11
Accounts payable to affiliated companies	(1)	(8)
Taxes accrued	12	(11)
Other current liabilities	(85)	16
Other assets	(38)	(50)
Other liabilities	64	(1)
Net cash provided by operating activities	742	921
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(540)	(506)
Purchases of available-for-sale securities	(12)	(5)
Proceeds from sales and maturities of available-for-sale securities	9	8
Net proceeds from the sales of equity investments and other assets		14
Notes receivable from affiliated companies payments		(166)
Notes receivable from affiliated companies	45
Other	(28)	13
Net cash used in investing activities	(526)	(642)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	495
Payments for the redemption of long-term debt	(476)	(2)
Notes payable to affiliated companies		(71)
Dividends to parent		(150)
Distributions to parent	(149)
Other	(1)
Net cash provided by (used in) financing activities	(131)	(223)
Net increase (decrease) in cash and cash equivalents	85	56
Cash and cash equivalents at beginning of period	9	6
Cash and cash equivalents at end of period	94	62
Significant non-cash transactions:
Accrued capital expenditures	$ 56	$ 46