Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 1,414	$ 520
Net Income (Loss) Attributable to Parent	1,407	512
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,784	1,748
Equity component of AFUDC	(82)	(61)
Gains on sales of other assets	(29)	(2)
Impairment charges	37	1,388
Deferred income taxes	699	(46)
Equity in earnings of unconsolidated affiliates	(36)	(69)
Accrued pension and other post-retirement benefit costs	36	54
Contributions to pension plans	(132)
Payments for asset retirement obligations	(125)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(29)	116
Receivables	105	(118)
Inventory	2	122
Other current assets	(161)	(451)
Increase (decrease) in
Accounts payable	(288)	(218)
Taxes accrued	(29)	(84)
Other current liabilities	(145)	(308)
Other assets	(63)	(45)
Other liabilities	(79)	73
Net cash provided by operating activities	2,879	2,619
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,062)	(2,400)
Investment expenditures	(98)	(38)
Acquisitions	(29)	(16)
Purchases of available-for-sale securities	(2,187)	(1,773)
Proceeds from sales and maturities of available-for-sale securities	2,200	1,793
Net proceeds from the sales of equity investments and other assets	2,832	119
Change in restricted cash	(3)	(6)
Other	53	(46)
Net cash used in investing activities	(294)	(2,367)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	574	2,088
Proceeds from the issuance of common stock related to employee benefit plans	16	23
Payments for the redemption of long-term debt	(1,246)	(1,757)
Proceeds from issuance of short-term debt with original maturities greater than 90 days	287
Payments for the redemption of short-term debt with original maturities greater than 90 days	(664)
Notes payable and commercial paper	12	1,024
Distributions to noncontrolling interests	(7)	(9)
Dividends paid	(1,115)	(1,107)
Repurchase of common shares	(1,500)
Other	(18)	(7)
Net cash (used in) provided by financing activities	(3,661)	255
Net (decrease) increase in cash and cash equivalents	(1,076)	507
Cash and cash equivalents at beginning of period	2,036	1,501
Cash and cash equivalents at end of period	960	2,008
Significant non-cash transactions:
Accrued capital expenditures	547	348
Duke Energy Carolinas [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	557	556
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	670	621
Equity component of AFUDC	(48)	(44)
Impairment charges		3
Deferred income taxes	184	132
Accrued pension and other post-retirement benefit costs	7	11
Contributions to pension plans	(42)
Payments for asset retirement obligations	(60)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		3
Receivables	45	(39)
Receivable from affiliated companies	(31)	(12)
Inventory	(31)	157
Other current assets	34	(150)
Increase (decrease) in
Accounts payable	(200)	(107)
Accounts payable to affiliated companies	(13)	(5)
Taxes accrued	73	95
Other current liabilities	(33)	(57)
Other assets	58	6
Other liabilities	(49)	15
Net cash provided by operating activities	1,121	1,185
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(954)	(851)
Purchases of available-for-sale securities	(1,410)	(1,098)
Proceeds from sales and maturities of available-for-sale securities	1,410	1,087
Notes receivable from affiliated companies	(550)	(58)
Other	8	(14)
Net cash used in investing activities	(1,496)	(934)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	496
Dividends or distributions to parent	(100)	(251)
Other	(6)
Net cash (used in) provided by financing activities	390	(251)
Net (decrease) increase in cash and cash equivalents	15
Cash and cash equivalents at beginning of period	13	23
Cash and cash equivalents at end of period	28	23
Significant non-cash transactions:
Accrued capital expenditures	160	113
Progress Energy [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	480	405
Net Income (Loss) Attributable to Parent	475	404
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	648	642
Equity component of AFUDC	(26)	(9)
Gains on sales of other assets	(14)	3
Impairment charges		(17)
Deferred income taxes	358	261
Accrued pension and other post-retirement benefit costs	(3)	14
Contributions to pension plans	(42)
Payments for asset retirement obligations	(61)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	5	14
Receivables	(103)	(166)
Receivable from affiliated companies	(55)	(15)
Inventory	62	(18)
Other current assets	215	(199)
Increase (decrease) in
Accounts payable	(182)	(41)
Accounts payable to affiliated companies	68	111
Taxes accrued	94	49
Other current liabilities	(9)	(157)
Other assets	(70)	(71)
Other liabilities	(32)	(27)
Net cash provided by operating activities	1,333	779
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,170)	(888)
Purchases of available-for-sale securities	(562)	(453)
Proceeds from sales and maturities of available-for-sale securities	624	442
Notes receivable from affiliated companies	220	10
Other	4	(41)
Net cash used in investing activities	(884)	(930)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		875
Payments for the redemption of long-term debt	(549)	(473)
Notes payable to affiliated companies	110	(229)
Distributions to noncontrolling interests	(4)	(2)
Other	(3)	(40)
Net cash (used in) provided by financing activities	(446)	131
Net (decrease) increase in cash and cash equivalents	3	(20)
Cash and cash equivalents at beginning of period	42	58
Cash and cash equivalents at end of period	45	38
Significant non-cash transactions:
Accrued capital expenditures	271	156
Duke Energy Progress [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	268	234
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	389	368
Equity component of AFUDC	(23)	(9)
Gains on sales of other assets	(1)	(1)
Impairment charges		(18)
Deferred income taxes	177	156
Accrued pension and other post-retirement benefit costs	(7)	(4)
Contributions to pension plans	(21)
Payments for asset retirement obligations	(32)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(3)	7
Receivables	(64)	(8)
Receivable from affiliated companies	6	(4)
Inventory	53	(22)
Other current assets	156	(151)
Increase (decrease) in
Accounts payable	(128)	(61)
Accounts payable to affiliated companies	62	59
Taxes accrued	66	11
Other current liabilities	(15)	(52)
Other assets	(31)	(13)
Other liabilities	(21)	(7)
Net cash provided by operating activities	831	485
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(699)	(540)
Purchases of available-for-sale securities	(319)	(269)
Proceeds from sales and maturities of available-for-sale securities	301	253
Notes receivable from affiliated companies	237
Other	6	(34)
Net cash used in investing activities	(474)	(590)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		650
Payments for the redemption of long-term debt	(544)	(168)
Notes payable to affiliated companies	192	(261)
Dividends or distributions to parent		(125)
Other	(1)	(5)
Net cash (used in) provided by financing activities	(353)	91
Net (decrease) increase in cash and cash equivalents	4	(14)
Cash and cash equivalents at beginning of period	9	21
Cash and cash equivalents at end of period	13	7
Significant non-cash transactions:
Accrued capital expenditures	135	113
Duke Energy Florida [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	278	250
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	258	273
Equity component of AFUDC	(2)
Impairment charges		1
Deferred income taxes	237	84
Accrued pension and other post-retirement benefit costs	3	15
Contributions to pension plans	(21)
Payments for asset retirement obligations	(28)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	5	3
Receivables	(40)	(82)
Receivable from affiliated companies	(53)	(4)
Inventory	10	4
Other current assets	10	(49)
Increase (decrease) in
Accounts payable	(53)	58
Accounts payable to affiliated companies	3	29
Taxes accrued	65	108
Other current liabilities	5	(94)
Other assets	(44)	(58)
Other liabilities	(19)	(29)
Net cash provided by operating activities	614	509
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(471)	(348)
Purchases of available-for-sale securities	(243)	(183)
Proceeds from sales and maturities of available-for-sale securities	323	188
Notes receivable from affiliated companies		(76)
Other	1	(8)
Net cash used in investing activities	(390)	(427)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		225
Payments for the redemption of long-term debt	(5)	(4)
Notes payable to affiliated companies	137	(181)
Dividends or distributions to parent	(350)	(124)
Other	(1)	(1)
Net cash (used in) provided by financing activities	(219)	(85)
Net (decrease) increase in cash and cash equivalents	5	(3)
Cash and cash equivalents at beginning of period	8	16
Cash and cash equivalents at end of period	13	13
Significant non-cash transactions:
Accrued capital expenditures	136	44
Duke Energy Ohio [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	97	(997)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	117	154
Equity component of AFUDC	(2)	(2)
Gains on sales of other assets	(8)
Impairment charges	40	1,438
Deferred income taxes	62	(513)
Accrued pension and other post-retirement benefit costs	4	4
Contributions to pension plans	(1)
Payments for asset retirement obligations	(1)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(12)	139
Receivables	6	(98)
Receivable from affiliated companies	46	48
Inventory	3	(4)
Other current assets	32	(30)
Increase (decrease) in
Accounts payable	(12)	(6)
Accounts payable to affiliated companies	19	(3)
Taxes accrued	(68)	(74)
Other current liabilities	99	(9)
Other assets	19	(36)
Other liabilities	(52)	(8)
Net cash provided by operating activities	388	3
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(166)	(167)
Notes receivable from affiliated companies	130	(127)
Other	(4)
Net cash used in investing activities	(40)	(294)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments for the redemption of long-term debt	(152)	(405)
Notes payable to affiliated companies	(193)	785
Dividends or distributions to parent		(100)
Other	(1)
Net cash (used in) provided by financing activities	(346)	280
Net (decrease) increase in cash and cash equivalents	2	(11)
Cash and cash equivalents at beginning of period	20	36
Cash and cash equivalents at end of period	22	25
Significant non-cash transactions:
Accrued capital expenditures	19	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 (Loss) Attributable to Parent	176	200
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	214	206
Equity component of AFUDC	(6)	(6)
Gains on sales of other assets	(1)
Deferred income taxes	232	45
Accrued pension and other post-retirement benefit costs	6	7
Contributions to pension plans	(9)
Payments for asset retirement obligations	(3)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(2)
Receivables	(1)	(19)
Receivable from affiliated companies	6	43
Inventory	(42)	(6)
Other current assets	87	(16)
Increase (decrease) in
Accounts payable	26	(47)
Accounts payable to affiliated companies	2	13
Taxes accrued	(21)	51
Other current liabilities	5	(4)
Other assets	(31)	(8)
Other liabilities	(43)	35
Net cash provided by operating activities	595	494
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(380)	(291)
Purchases of available-for-sale securities	(4)	(9)
Proceeds from sales and maturities of available-for-sale securities	3	6
Net proceeds from the sales of equity investments and other assets	14
Notes receivable from affiliated companies	(25)	21
Other	25	3
Net cash used in investing activities	(367)	(270)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments for the redemption of long-term debt		(1)
Notes payable to affiliated companies	(71)
Dividends or distributions to parent	(150)	(225)
Other	(1)	(1)
Net cash (used in) provided by financing activities	(222)	(227)
Net (decrease) increase in cash and cash equivalents	6	(3)
Cash and cash equivalents at beginning of period	6	15
Cash and cash equivalents at end of period	12	12
Significant non-cash transactions:
Accrued capital expenditures	$ 46	$ 43