Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	$ 512	$ 973
Net income (loss)	520	976
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,748	1,544
Equity component of AFUDC	(61)	(82)
Gains (losses) on sales of other assets	(2)	8
Impairment charges	1,388	386
Deferred income taxes	(46)	397
Equity in earnings of unconsolidated affiliates	(69)	(58)
Accrued pension and other post-retirement benefit costs	54	172
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	116	40
Receivables	(118)	(144)
Inventory	122	84
Other current assets	(451)	(43)
Increase (decrease) in
Accounts payable	(218)	(308)
Taxes accrued	(84)	95
Other current liabilities	(308)	4
Other assets	(45)	(175)
Other liabilities	73	(53)
Net cash provided by operating activities	2,619	2,843
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(2,400)	(2,715)
Investment expenditures	(38)	(49)
Acquisitions	(16)	0
Purchases of available-for-sale securities	(1,773)	(2,827)
Proceeds from sales and maturities of available-for-sale securities	1,793	2,775
Net proceeds from the sales of other assets	119	38
Change in restricted cash	(6)	188
Other	(46)	28
Net cash used in investing activities	(2,367)	(2,562)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	2,088	1,832
Proceeds from the issuance of common stock related to employee benefit plans	23	7
Payments for the redemption of long-term debt	(1,757)	(1,538)
Payments for the redemption of preferred stock	0	(96)
Notes payable and commercial paper	1,024	763
Distributions to noncontrolling interests	(9)	(8)
Dividends paid	(1,107)	(1,085)
Other	(7)	(9)
Net cash provided by (used in) financing activities	255	(134)
Net increase in cash and cash equivalents	507	147
Cash and cash equivalents at beginning of period	1,501	1,424
Cash and cash equivalents at end of period	2,008	1,571
Significant non-cash transactions:
Accrued capital expenditures	348	480
Dividends declared but not paid	0	551
Duke Energy Carolinas [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	556	425
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	621	569
Equity component of AFUDC	(44)	(47)
Gains (losses) on sales of other assets		(2)
Impairment charges	3	0
Deferred income taxes	132	247
Accrued pension and other post-retirement benefit costs	11	20
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	3	(7)
Receivables	(39)	(3)
Receivables from affiliated companies	(12)	(46)
Inventory	157	(12)
Other current assets	(150)	(14)
Increase (decrease) in
Accounts payable	(107)	(44)
Accounts payable to affiliated companies	(5)	(6)
Taxes accrued	95	(5)
Other current liabilities	(57)	(50)
Other assets	6	(68)
Other liabilities	15	(41)
Net cash provided by operating activities	1,185	916
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(851)	(804)
Purchases of available-for-sale securities	(1,098)	(1,122)
Proceeds from sales and maturities of available-for-sale securities	1,087	1,098
Notes receivable from affiliated companies	(58)	167
Other	(14)	(10)
Net cash used in investing activities	(934)	(671)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends or distributions to parent	(251)	(249)
Other	0	(2)
Net cash provided by (used in) financing activities	(251)	(251)
Net increase in cash and cash equivalents	0	(6)
Cash and cash equivalents at beginning of period	23	19
Cash and cash equivalents at end of period	23	13
Significant non-cash transactions:
Accrued capital expenditures	113	125
Progress Energy [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	404	136
Net income (loss)	405	137
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	642	480
Equity component of AFUDC	(9)	(27)
Gains (losses) on sales of other assets	3	4
Impairment charges	(17)	366
Deferred income taxes	261	71
Accrued pension and other post-retirement benefit costs	14	105
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	14	23
Receivables	(166)	(148)
Receivables from affiliated companies	(15)	12
Inventory	(18)	69
Other current assets	(199)	(33)
Increase (decrease) in
Accounts payable	(41)	(203)
Accounts payable to affiliated companies	111	48
Taxes accrued	49	124
Other current liabilities	(157)	169
Other assets	(71)	(126)
Other liabilities	(27)	88
Net cash provided by operating activities	779	1,159
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(888)	(1,295)
Purchases of available-for-sale securities	(453)	(978)
Proceeds from sales and maturities of available-for-sale securities	442	960
Notes receivable from affiliated companies	10	(101)
Other	(41)	21
Net cash used in investing activities	(930)	(1,393)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	875	545
Payments for the redemption of long-term debt	(473)	(788)
Payments for the redemption of preferred stock	0	(96)
Notes payable to affiliated companies	(229)	403
Distributions to noncontrolling interests	(2)	(2)
Other	(40)	(5)
Net cash provided by (used in) financing activities	131	57
Net increase in cash and cash equivalents	(20)	(177)
Cash and cash equivalents at beginning of period	58	231
Cash and cash equivalents at end of period	38	54
Significant non-cash transactions:
Accrued capital expenditures	156	310
Duke Energy Progress [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	234	187
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	368	324
Equity component of AFUDC	(9)	(23)
Gains (losses) on sales of other assets	(1)	0
Impairment charges	(18)	22
Deferred income taxes	156	146
Accrued pension and other post-retirement benefit costs	(4)	48
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	7	(12)
Receivables	(8)	(49)
Receivables from affiliated companies	(4)	(3)
Inventory	(22)	23
Other current assets	(151)	(69)
Increase (decrease) in
Accounts payable	(61)	(142)
Accounts payable to affiliated companies	59	27
Taxes accrued	11	41
Other current liabilities	(52)	(49)
Other assets	(13)	(53)
Other liabilities	(7)	5
Net cash provided by operating activities	485	423
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(540)	(725)
Purchases of available-for-sale securities	(269)	(318)
Proceeds from sales and maturities of available-for-sale securities	253	299
Other	(34)	3
Net cash used in investing activities	(590)	(741)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	650	545
Payments for the redemption of long-term debt	(168)	(50)
Payments for the redemption of preferred stock		(62)
Notes payable to affiliated companies	(261)	(107)
Dividends or distributions to parent	(125)	0
Other	(5)	(6)
Net cash provided by (used in) financing activities	91	320
Net increase in cash and cash equivalents	(14)	2
Cash and cash equivalents at beginning of period	21	18
Cash and cash equivalents at end of period	7	20
Significant non-cash transactions:
Accrued capital expenditures	113	216
Duke Energy Florida [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	250	53
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	273	145
Equity component of AFUDC		(4)
Gains (losses) on sales of other assets		(1)
Impairment charges	1	345
Deferred income taxes	84	34
Accrued pension and other post-retirement benefit costs	15	43
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	3	33
Receivables	(82)	(85)
Receivables from affiliated companies	(4)	20
Inventory	4	44
Other current assets	(49)	(44)
Increase (decrease) in
Accounts payable	58	26
Accounts payable to affiliated companies	29	(3)
Taxes accrued	108	127
Other current liabilities	(94)	232
Other assets	(58)	(76)
Other liabilities	(29)	23
Net cash provided by operating activities	509	912
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(348)	(564)
Purchases of available-for-sale securities	(183)	(661)
Proceeds from sales and maturities of available-for-sale securities	188	661
Notes receivable from affiliated companies	(76)	207
Other	(8)	9
Net cash used in investing activities	(427)	(348)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	225
Payments for the redemption of long-term debt	(4)	(429)
Payments for the redemption of preferred stock		(34)
Notes payable to affiliated companies	(181)	11
Dividends or distributions to parent	(124)	(225)
Other	(1)
Net cash provided by (used in) financing activities	(85)	(677)
Net increase in cash and cash equivalents	(3)	(113)
Cash and cash equivalents at beginning of period	16	131
Cash and cash equivalents at end of period	13	18
Significant non-cash transactions:
Accrued capital expenditures	44	93
Duke Energy Ohio [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	(997)	37
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	154	179
Equity component of AFUDC	(2)
Gains (losses) on sales of other assets		(4)
Impairment charges	1,438
Deferred income taxes	(513)	15
Accrued pension and other post-retirement benefit costs	4	9
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	139	22
Receivables	(98)	(19)
Receivables from affiliated companies	48	(8)
Inventory	(4)	21
Other current assets	(30)	(19)
Increase (decrease) in
Accounts payable	(6)	(36)
Accounts payable to affiliated companies	(3)	(4)
Taxes accrued	(74)	(49)
Other current liabilities	(9)	(2)
Other assets	(36)	(9)
Other liabilities	(8)	(23)
Net cash provided by operating activities	3	110
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(167)	(222)
Net proceeds from the sales of other assets		11
Notes receivable from affiliated companies	(127)	(18)
Net cash used in investing activities	(294)	(229)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments for the redemption of long-term debt	(405)	(253)
Notes payable to affiliated companies	785	357
Dividends or distributions to parent	(100)
Other		(1)
Net cash provided by (used in) financing activities	280	103
Net increase in cash and cash equivalents	(11)	(16)
Cash and cash equivalents at beginning of period	36	31
Cash and cash equivalents at end of period	25	15
Significant non-cash transactions:
Accrued capital expenditures	19	18
Duke Energy Indiana [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	200	172
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	206	158
Equity component of AFUDC	(6)	(7)
Deferred income taxes	45	92
Accrued pension and other post-retirement benefit costs	7	12
(Increase) decrease in
Receivables	(19)	(2)
Receivables from affiliated companies	43	(6)
Inventory	(6)	(17)
Other current assets	(16)	(1)
Increase (decrease) in
Accounts payable	(47)	(7)
Accounts payable to affiliated companies	13	(13)
Taxes accrued	51	(8)
Other current liabilities	(4)	(10)
Other assets	(8)	11
Other liabilities	35	(18)
Net cash provided by operating activities	494	356
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(291)	(281)
Purchases of available-for-sale securities	(9)	(5)
Proceeds from sales and maturities of available-for-sale securities	6	5
Notes receivable from affiliated companies	21	(21)
Other	3	1
Net cash used in investing activities	(270)	(301)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments for the redemption of long-term debt	(1)	(1)
Notes payable to affiliated companies		(81)
Dividends or distributions to parent	(225)
Other	(1)	(1)
Net cash provided by (used in) financing activities	(227)	(83)
Net increase in cash and cash equivalents	(3)	(28)
Cash and cash equivalents at beginning of period	15	36
Cash and cash equivalents at end of period	12	8
Significant non-cash transactions:
Accrued capital expenditures	$ 43	$ 32