Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 867us-gaap_ProfitLoss	$ (93)us-gaap_ProfitLoss
Net Income (Loss) Attributable to Parent	864us-gaap_NetIncomeLoss	(97)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	883	884
Equity component of AFUDC	(42)	(28)
Gains on sales of other assets	(16)us-gaap_GainLossOnSaleOfOtherAssets
Impairment charges	43us-gaap_OtherAssetImpairmentCharges	1,382us-gaap_OtherAssetImpairmentCharges
Deferred income taxes	368	(178)
Equity in earnings of unconsolidated affiliates	(13)	(36)
Accrued pension and other post-retirement benefit costs	18	27
Contributions to pension plans	(132)us-gaap_PensionContributions
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(47)us-gaap_UnrealizedGainLossOnDerivatives	45us-gaap_UnrealizedGainLossOnDerivatives
Receivables	(41)us-gaap_IncreaseDecreaseInReceivables	29us-gaap_IncreaseDecreaseInReceivables
Inventory	57us-gaap_IncreaseDecreaseInInventories	272us-gaap_IncreaseDecreaseInInventories
Other current assets	(63)	(297)
Increase (decrease) in
Accounts payable	(201)	(97)
Taxes accrued	(63)	(175)
Other current liabilities	(85)	(346)
Other assets	30	(22)
Other liabilities	(123)	6
Net cash provided by operating activities	1,440	1,373
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,411)	(1,232)
Investment expenditures	(14)	(36)
Acquisitions	(29)
Purchases of available-for-sale securities	(1,035)	(967)
Proceeds from sales and maturities of available-for-sale securities	1,069	1,004
Net proceeds from the sales of equity investments and other assets	1	4
Change in restricted cash	(36)	(27)
Other	(1)	(32)
Net cash used in investing activities	(1,456)	(1,286)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	497	875
Proceeds from the issuance of common stock related to employee benefit plans	15	19
Payments for the redemption of long-term debt	(403)us-gaap_RepaymentsOfLongTermDebt	(1,287)us-gaap_RepaymentsOfLongTermDebt
Proceeds from issuance of short-term debt with original maturities greater than 90 days	187
Payments for the redemption of short-term debt with original maturities greater than 90 days	(643)
Notes payable and commercial paper	1,727	898
Distributions to noncontrolling interests		(3)
Dividends paid	(564)us-gaap_PaymentsOfDividends	(553)us-gaap_PaymentsOfDividends
Other	(15)	(6)
Net cash provided by (used in) financing activities	801	(57)
Net increase in cash and cash equivalents	785	30
Cash and cash equivalents at beginning of period	2,036	1,501
Cash and cash equivalents at end of period	2,821	1,531
Significant non-cash transactions:
Accrued capital expenditures	438	361
Duke Energy Carolinas [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	292	286
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	324	309
Equity component of AFUDC	(24)	(22)
Deferred income taxes	113	87
Accrued pension and other post-retirement benefit costs	4	6
Contributions to pension plans	(42)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		3
Receivables	16	11
Receivable from affiliated companies	(16)	(27)
Inventory	7	181
Other current assets	2	(59)
Increase (decrease) in
Accounts payable	(133)	(100)
Accounts payable to affiliated companies	50	21
Taxes accrued	(17)	(3)
Other current liabilities	(27)	(26)
Other assets	44	14
Other liabilities	(17)	(9)
Net cash provided by operating activities	576	672
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(448)	(426)
Purchases of available-for-sale securities	(643)	(584)
Proceeds from sales and maturities of available-for-sale securities	643	579
Notes receivable from affiliated companies	(605)	(115)
Other	4	(6)
Net cash used in investing activities	(1,049)	(552)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	496
Dividends or distributions to parent		(126)
Other	(6)
Net cash provided by (used in) financing activities	490	(126)
Net increase in cash and cash equivalents	17	(6)
Cash and cash equivalents at beginning of period	13	23
Cash and cash equivalents at end of period	30	17
Significant non-cash transactions:
Accrued capital expenditures	102	133
Progress Energy [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	263	203
Net Income (Loss) Attributable to Parent	260	202
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	329	316
Equity component of AFUDC	(14)	(1)
Gains on sales of other assets	(8)	(1)
Deferred income taxes	196	183
Accrued pension and other post-retirement benefit costs	(1)	7
Contributions to pension plans	(42)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(22)	13
Receivables	(66)	(45)
Receivable from affiliated companies	(21)
Inventory	47	72
Other current assets	302	(134)
Increase (decrease) in
Accounts payable	(107)	(53)
Accounts payable to affiliated companies	83	114
Taxes accrued	47	3
Other current liabilities	(10)	(116)
Other assets	(21)	(52)
Other liabilities	(48)	(6)
Net cash provided by operating activities	907	503
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(563)	(475)
Purchases of available-for-sale securities	(298)	(266)
Proceeds from sales and maturities of available-for-sale securities	367	269
Notes receivable from affiliated companies	42	(101)
Other	(20)	(25)
Net cash used in investing activities	(472)	(598)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		875
Payments for the redemption of long-term debt	(245)	(469)
Notes payable to affiliated companies	(185)	(291)
Distributions to noncontrolling interests		(3)
Other	(3)	(39)
Net cash provided by (used in) financing activities	(433)	73
Net increase in cash and cash equivalents	2	(22)
Cash and cash equivalents at beginning of period	42	58
Cash and cash equivalents at end of period	44	36
Significant non-cash transactions:
Accrued capital expenditures	176	158
Duke Energy Progress [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	183	133
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	193	183
Equity component of AFUDC	(13)	(2)
Gains on sales of other assets	(1)	(1)
Deferred income taxes	138	117
Accrued pension and other post-retirement benefit costs	(4)	(2)
Contributions to pension plans	(21)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(4)	6
Receivables	(92)	10
Receivable from affiliated companies	6	(5)
Inventory	37	53
Other current assets	170	(183)
Increase (decrease) in
Accounts payable	(52)	(37)
Accounts payable to affiliated companies	63	139
Taxes accrued	14
Other current liabilities	(28)	(41)
Other assets	(2)	(13)
Other liabilities	(23)	(1)
Net cash provided by operating activities	564	356
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(338)	(299)
Purchases of available-for-sale securities	(149)	(151)
Proceeds from sales and maturities of available-for-sale securities	144	149
Notes receivable from affiliated companies	32	(65)
Other	(12)	(18)
Net cash used in investing activities	(323)	(384)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		650
Payments for the redemption of long-term debt	(243)	(168)
Notes payable to affiliated companies		(462)
Other	(1)	(4)
Net cash provided by (used in) financing activities	(244)	16
Net increase in cash and cash equivalents	(3)	(12)
Cash and cash equivalents at beginning of period	9	21
Cash and cash equivalents at end of period	6	9
Significant non-cash transactions:
Accrued capital expenditures	82	116
Duke Energy Florida [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	113	108
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	136	133
Equity component of AFUDC	(1)
Deferred income taxes	39	60
Accrued pension and other post-retirement benefit costs	1	7
Contributions to pension plans	(21)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(20)	5
Receivables	24	21
Receivable from affiliated companies	(20)	(7)
Inventory	10	20
Other current assets	143	68
Increase (decrease) in
Accounts payable	(54)	24
Accounts payable to affiliated companies	15	28
Taxes accrued	61	10
Other current liabilities	24	(63)
Other assets	(17)	(36)
Other liabilities	(29)	(13)
Net cash provided by operating activities	404	365
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(224)	(176)
Purchases of available-for-sale securities	(149)	(115)
Proceeds from sales and maturities of available-for-sale securities	223	120
Notes receivable from affiliated companies		(110)
Other	(7)	(8)
Net cash used in investing activities	(157)	(289)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		225
Payments for the redemption of long-term debt	(2)	(1)
Notes payable to affiliated companies	108	(181)
Dividends or distributions to parent	(350)	(124)
Other	(1)	(1)
Net cash provided by (used in) financing activities	(245)	(82)
Net increase in cash and cash equivalents	2	(6)
Cash and cash equivalents at beginning of period	8	16
Cash and cash equivalents at end of period	10	10
Significant non-cash transactions:
Accrued capital expenditures	94	42
Duke Energy Ohio [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	149	(890)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	58	92
Equity component of AFUDC	(1)	(1)
Gains on sales of other assets	(6)
Impairment charges	40	1,417
Deferred income taxes	25	(501)
Accrued pension and other post-retirement benefit costs	2	1
Contributions to pension plans	(1)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(28)	39
Receivables	(8)	(16)
Receivable from affiliated companies	16	(6)
Inventory	(3)	29
Other current assets	80	(92)
Increase (decrease) in
Accounts payable	20	21
Accounts payable to affiliated companies	49	(13)
Taxes accrued	(4)	(38)
Other current liabilities	24	(7)
Other assets	15	(9)
Other liabilities	(74)	7
Net cash provided by operating activities	353	33
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(81)	(83)
Notes receivable from affiliated companies	105	(110)
Net cash used in investing activities	24	(193)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments for the redemption of long-term debt	(151)	(1)
Notes payable to affiliated companies	(193)	263
Dividends or distributions to parent		(100)
Other	(1)
Net cash provided by (used in) financing activities	(345)	162
Net increase in cash and cash equivalents	32	2
Cash and cash equivalents at beginning of period	20	36
Cash and cash equivalents at end of period	52	38
Significant non-cash transactions:
Accrued capital expenditures	15	24
Duke Energy Indiana [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	108	113
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	105	103
Equity component of AFUDC	(3)	(4)
Deferred income taxes	140	(39)
Accrued pension and other post-retirement benefit costs	3	4
Contributions to pension plans	(9)
(Increase) decrease in
Receivables	3	(23)
Receivable from affiliated companies	1	10
Inventory	(5)	(10)
Other current assets	9	(41)
Increase (decrease) in
Accounts payable	21	(36)
Accounts payable to affiliated companies	1	12
Taxes accrued	13	110
Other current liabilities	6	(6)
Other assets	(8)	(3)
Other liabilities	(24)	50
Net cash provided by operating activities	361	240
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(188)	(133)
Purchases of available-for-sale securities	(3)	(3)
Proceeds from sales and maturities of available-for-sale securities	2	3
Notes receivable from affiliated companies	(106)	(94)
Other	16
Net cash used in investing activities	(279)	(227)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments for the redemption of long-term debt		(1)
Notes payable to affiliated companies	(71)
Other	(1)	(1)
Net cash provided by (used in) financing activities	(72)	(2)
Net increase in cash and cash equivalents	10	11
Cash and cash equivalents at beginning of period	6	15
Cash and cash equivalents at end of period	16	26
Significant non-cash transactions:
Accrued capital expenditures	$ 60	$ 32

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