Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 1,211	$ 1,414
Net Income Attributable to Parent	1,203	1,407
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,868	1,784
Equity component of AFUDC	(87)	(82)
Gains on sales of other assets	(18)	(29)
Impairment charges	198	37
Deferred income taxes	285	699
Equity in earnings of unconsolidated affiliates	(23)	(36)
Accrued pension and other post-retirement benefit costs	8	36
Contributions to qualified pension plans		(132)
Payments for asset retirement obligations	(263)	(125)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	199	(29)
Receivables	(57)	105
Inventory	178	2
Other current assets	(51)	(161)
Increase (decrease) in
Accounts payable	(153)	(288)
Taxes accrued	216	(29)
Other current liabilities	(281)	(145)
Other assets	(9)	(63)
Other liabilities	(15)	(79)
Net cash provided by operating activities	3,206	2,879
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,393)	(3,062)
Investment expenditures	(136)	(98)
Acquisitions		(29)
Purchases of available-for-sale securities	(3,033)	(2,187)
Proceeds from sales and maturities of available-for-sale securities	3,059	2,200
Net proceeds from the sale of the Disposal Group		2,792
Net proceeds from the sales of equity investments and other assets	2	40
Change in restricted cash	(21)	(3)
Other	(86)	53
Net cash used in investing activities	(3,608)	(294)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3,514	574
Proceeds from the issuance of common stock related to employee benefit plans	7	16
Payments for the redemption of long-term debt	(795)	(1,246)
Proceeds from issuance of short-term debt with original maturities greater than 90 days	500	287
Payments for the redemption of short-term debt with original maturities greater than 90 days	(492)	(664)
Notes payable and commercial paper	(1,349)	12
Distributions to noncontrolling interests	(3)	(7)
Dividends paid	(1,140)	(1,115)
Repurchase of common shares		(1,500)
Other	(21)	(18)
Net cash provided by (used in) financing activities	221	(3,661)
Net increase (decrease) in cash and cash equivalents	(181)	(1,076)
Cash and cash equivalents at beginning of period	857	2,036
Cash and cash equivalents at end of period	676	960
Significant non-cash transactions:
Accrued capital expenditures	670	547
Duke Energy Carolinas [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income Attributable to Parent	532	557
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	673	670
Equity component of AFUDC	(48)	(48)
Deferred income taxes	273	184
Accrued pension and other post-retirement benefit costs	2	7
Contributions to qualified pension plans		(42)
Payments for asset retirement obligations	(118)	(60)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	3
Receivables	(48)	45
Receivable from affiliated companies	36	(31)
Inventory	102	(31)
Other current assets	24	34
Increase (decrease) in
Accounts payable	(226)	(200)
Accounts payable to affiliated companies	(56)	(13)
Taxes accrued	188	73
Other current liabilities	28	(33)
Other assets	22	58
Other liabilities	(14)	(49)
Net cash provided by operating activities	1,373	1,121
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,031)	(954)
Purchases of available-for-sale securities	(1,395)	(1,410)
Proceeds from sales and maturities of available-for-sale securities	1,395	1,410
Notes receivable from affiliated companies payments	(89)	(550)
Other	(41)	8
Net cash used in investing activities	(1,161)	(1,496)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	992	496
Payments for the redemption of long-term debt	(1)
Distributions to parent	(1,200)	(100)
Other		(6)
Net cash provided by (used in) financing activities	(209)	390
Net increase (decrease) in cash and cash equivalents	3	15
Cash and cash equivalents at beginning of period	13	13
Cash and cash equivalents at end of period	16	28
Significant non-cash transactions:
Accrued capital expenditures	228	160
Progress Energy [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	486	480
Net Income Attributable to Parent	481	475
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	696	648
Equity component of AFUDC	(30)	(26)
Gains on sales of other assets	(15)	(14)
Impairment charges	3
Deferred income taxes	285	358
Accrued pension and other post-retirement benefit costs	(12)	(3)
Contributions to qualified pension plans		(42)
Payments for asset retirement obligations	(126)	(61)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	32	5
Receivables	(66)	(103)
Receivable from affiliated companies	306	(55)
Inventory	25	62
Other current assets	45	215
Increase (decrease) in
Accounts payable	(26)	(182)
Accounts payable to affiliated companies	(79)	68
Taxes accrued	90	94
Other current liabilities	(162)	(9)
Other assets	(72)	(70)
Other liabilities	15	(32)
Net cash provided by operating activities	1,395	1,333
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,441)	(1,170)
Purchases of available-for-sale securities	(1,570)	(562)
Proceeds from sales and maturities of available-for-sale securities	1,594	624
Proceeds from Insurance	58
Notes receivable from affiliated companies		220
Change in restricted cash	(6)
Other	(14)	4
Net cash used in investing activities	(1,379)	(884)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,338
Payments for the redemption of long-term debt	(320)	(549)
Notes payable to affiliated companies	(392)	110
Distributions to noncontrolling interests	(1)	(4)
Dividends to parent	(651)
Other		(3)
Net cash provided by (used in) financing activities	(26)	(446)
Net increase (decrease) in cash and cash equivalents	(10)	3
Cash and cash equivalents at beginning of period	44	42
Cash and cash equivalents at end of period	34	45
Significant non-cash transactions:
Accrued capital expenditures	288	271
Duke Energy Progress [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income Attributable to Parent	268	268
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	451	389
Equity component of AFUDC	(20)	(23)
Gains on sales of other assets	(3)	(1)
Deferred income taxes	172	177
Accrued pension and other post-retirement benefit costs	(16)	(7)
Contributions to qualified pension plans		(21)
Payments for asset retirement obligations	(100)	(32)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(1)	(3)
Receivables	(19)	(64)
Receivable from affiliated companies	7	6
Inventory	20	53
Other current assets	131	156
Increase (decrease) in
Accounts payable	(28)	(128)
Accounts payable to affiliated companies	(56)	62
Taxes accrued	56	66
Other current liabilities	(12)	(15)
Other assets	(26)	(31)
Other liabilities	(6)	(21)
Net cash provided by operating activities	818	831
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(704)	(699)
Purchases of available-for-sale securities	(1,299)	(319)
Proceeds from sales and maturities of available-for-sale securities	1,284	301
Notes receivable from affiliated companies		237
Other	(19)	6
Net cash used in investing activities	(738)	(474)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	59
Payments for the redemption of long-term debt	(15)	(544)
Notes payable to affiliated companies	(131)	192
Other		(1)
Net cash provided by (used in) financing activities	(87)	(353)
Net increase (decrease) in cash and cash equivalents	(7)	4
Cash and cash equivalents at beginning of period	15	9
Cash and cash equivalents at end of period	8	13
Significant non-cash transactions:
Accrued capital expenditures	73	135
Duke Energy Florida [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income Attributable to Parent	281	278
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	239	258
Equity component of AFUDC	(9)	(2)
Impairment charges	3
Deferred income taxes	113	237
Accrued pension and other post-retirement benefit costs	1	3
Contributions to qualified pension plans		(21)
Payments for asset retirement obligations	(25)	(28)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	34	5
Receivables	(49)	(40)
Receivable from affiliated companies	23	(53)
Inventory	5	10
Other current assets	(13)	10
Increase (decrease) in
Accounts payable	3	(53)
Accounts payable to affiliated companies	(16)	3
Taxes accrued	5	65
Other current liabilities	(142)	5
Other assets	(47)	(44)
Other liabilities	20	(19)
Net cash provided by operating activities	426	614
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(737)	(471)
Purchases of available-for-sale securities	(271)	(243)
Proceeds from sales and maturities of available-for-sale securities	310	323
Proceeds from Insurance	58
Change in restricted cash	(6)
Other	5	1
Net cash used in investing activities	(641)	(390)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,278
Payments for the redemption of long-term debt	(5)	(5)
Notes payable to affiliated companies	(407)	137
Dividends to parent		(350)
Distributions to parent	(649)
Other	(2)	(1)
Net cash provided by (used in) financing activities	215	(219)
Net increase (decrease) in cash and cash equivalents		5
Cash and cash equivalents at beginning of period	8	8
Cash and cash equivalents at end of period	8	13
Significant non-cash transactions:
Accrued capital expenditures	215	136
Duke Energy Ohio [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income Attributable to Parent	82	97
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	127	117
Equity component of AFUDC	(2)	(2)
Gains on sales of other assets	(1)	(8)
Impairment charges		40
Deferred income taxes	68	62
Accrued pension and other post-retirement benefit costs	3	4
Contributions to qualified pension plans		(1)
Payments for asset retirement obligations	(3)	(1)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(2)	(12)
Receivables	3	6
Receivable from affiliated companies	49	46
Inventory	(5)	3
Other current assets	49	32
Increase (decrease) in
Accounts payable	8	(12)
Accounts payable to affiliated companies	23	19
Taxes accrued	(68)	(68)
Other current liabilities	(66)	99
Other assets	(8)	19
Other liabilities	(9)	(52)
Net cash provided by operating activities	248	388
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(214)	(166)
Notes receivable from affiliated companies payments	(186)
Notes receivable from affiliated companies		130
Other	(13)	(4)
Net cash used in investing activities	(413)	(40)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	341
Payments for the redemption of long-term debt	(52)	(152)
Notes payable to affiliated companies	(103)	(193)
Dividends to parent	(25)
Other		(1)
Net cash provided by (used in) financing activities	161	(346)
Net increase (decrease) in cash and cash equivalents	(4)	2
Cash and cash equivalents at beginning of period	14	20
Cash and cash equivalents at end of period	10	22
Significant non-cash transactions:
Accrued capital expenditures	30	19
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	180	176
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	223	214
Equity component of AFUDC	(7)	(6)
Gains on sales of other assets		(1)
Deferred income taxes	36	232
Accrued pension and other post-retirement benefit costs	4	6
Contributions to qualified pension plans		(9)
Payments for asset retirement obligations	(16)	(3)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(2)
Receivables	12	(1)
Receivable from affiliated companies	11	6
Inventory	62	(42)
Other current assets	(19)	87
Increase (decrease) in
Accounts payable	(22)	26
Accounts payable to affiliated companies	4	2
Taxes accrued	(42)	(21)
Other current liabilities	(60)	5
Other assets	(29)	(31)
Other liabilities	44	(43)
Net cash provided by operating activities	381	595
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(325)	(380)
Purchases of available-for-sale securities	(7)	(4)
Proceeds from sales and maturities of available-for-sale securities	5	3
Net proceeds from the sales of equity investments and other assets		14
Notes receivable from affiliated companies payments	(64)	(25)
Other	(6)	25
Net cash used in investing activities	(397)	(367)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	495
Payments for the redemption of long-term debt	(326)
Notes payable to affiliated companies		(71)
Dividends to parent		(150)
Distributions to parent	(149)
Other	(1)	(1)
Net cash provided by (used in) financing activities	19	(222)
Net increase (decrease) in cash and cash equivalents	3	6
Cash and cash equivalents at beginning of period	9	6
Cash and cash equivalents at end of period	12	12
Significant non-cash transactions:
Accrued capital expenditures	$ 43	$ 46