Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 1,789	$ 1,984
Net Income (Loss) Attributable to Parent	1,786	1,977
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	2,641	2,365
Equity component of AFUDC	(99)	(121)
Community support and charitable contributions expense		34
Gains (losses) on sales of other assets	(27)	8
Impairment charges	848	388
Deferred income taxes	562	1,014
Equity in earnings of unconsolidated affiliates	(97)	(91)
Accrued pension and other post-retirement benefit costs	81	259
Contributions to qualified pension plans		(27)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	128	(14)
Receivables	(24)	(154)
Inventory	(17)	119
Other current assets	(315)	(48)
Increase (decrease) in
Accounts payable	(303)	(412)
Taxes accrued	37	245
Other current liabilities	(99)	(31)
Other assets	(100)	(307)
Other liabilities	162	(221)
Net cash provided by operating activities	5,167	4,990
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,755)	(3,854)
Investment expenditures	(65)	(53)
Acquisitions	(16)
Purchases of available-for-sale securities	(2,424)	(4,591)
Proceeds from sales and maturities of available-for-sale securities	2,445	4,687
Net proceeds from the sales of equity investments and other assets	172	59
Change in restricted cash	(15)	166
Other	(76)	20
Net cash used in investing activities	(3,734)	(3,566)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	2,217	2,993
Proceeds from the issuance of common stock related to employee benefit plans	24	8
Payments for the redemption of long-term debt	(2,503)	(2,506)
Payments for the redemption of preferred stock		(96)
Notes payable and commercial paper	941	537
Distributions to noncontrolling interests	(45)	(9)
Dividends paid	(1,670)	(1,636)
Other	33	27
Net cash used in financing activities	(1,003)	(682)
Net increase in cash and cash equivalents	430	742
Cash and cash equivalents at beginning of period	1,501	1,424
Cash and cash equivalents at end of period	1,931	2,166
Significant non-cash transactions:
Accrued capital expenditures	466	383
Duke Energy Carolinas [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	933	767
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	952	865
Equity component of AFUDC	(68)	(70)
Community support and charitable contributions expense		14
Impairment charges	3
Deferred income taxes	47	487
Accrued pension and other post-retirement benefit costs	16	29
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(7)
Receivables	5	(24)
Receivables from affiliated companies	(42)	(37)
Inventory	91	23
Other current assets	(130)	35
Increase (decrease) in
Accounts payable	(167)	(90)
Accounts payable to affiliated companies	15	107
Taxes accrued	173	18
Other current liabilities	7	2
Other assets	23	(80)
Other liabilities	21	(66)
Net cash provided by operating activities	1,879	1,973
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,289)	(1,205)
Purchases of available-for-sale securities	(1,533)	(1,883)
Proceeds from sales and maturities of available-for-sale securities	1,516	1,847
Notes receivable from affiliated companies	(117)	(213)
Other	(27)	(11)
Net cash used in investing activities	(1,450)	(1,465)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments for the redemption of long-term debt	(42)
Dividends or distributions to parent	(376)	(500)
Other		(2)
Net cash used in financing activities	(418)	(502)
Net increase in cash and cash equivalents	11	6
Cash and cash equivalents at beginning of period	23	19
Cash and cash equivalents at end of period	34	25
Significant non-cash transactions:
Accrued capital expenditures	177	111
Progress Energy [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	735	479
Net Income (Loss) Attributable to Parent	733	477
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	985	764
Equity component of AFUDC	(18)	(39)
Community support and charitable contributions expense		20
Gains (losses) on sales of other assets	1	3
Impairment charges	(16)	368
Deferred income taxes	231	384
Accrued pension and other post-retirement benefit costs	20	158
Contributions to qualified pension plans		(27)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	28	33
Receivables	(162)	(219)
Receivables from affiliated companies	(32)	12
Inventory	(45)	79
Other current assets	(147)	(102)
Increase (decrease) in
Accounts payable	(73)	(227)
Accounts payable to affiliated companies	142	25
Taxes accrued	166	161
Other current liabilities	(96)	113
Other assets	(126)	(223)
Other liabilities	(9)	(64)
Net cash provided by operating activities	1,584	1,698
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,383)	(1,739)
Purchases of available-for-sale securities	(609)	(1,651)
Proceeds from sales and maturities of available-for-sale securities	594	1,630
Net proceeds from the sales of equity investments and other assets	2
Notes receivable from affiliated companies	(89)	(103)
Other	(39)	12
Net cash used in investing activities	(1,524)	(1,851)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	875	545
Payments for the redemption of long-term debt	(479)	(1,194)
Payments for the redemption of preferred stock		(96)
Notes payable to affiliated companies	(391)	740
Distributions to noncontrolling interests	(37)	(2)
Other	(39)	(5)
Net cash used in financing activities	(71)	(12)
Net increase in cash and cash equivalents	(11)	(165)
Cash and cash equivalents at beginning of period	58	231
Cash and cash equivalents at end of period	47	66
Significant non-cash transactions:
Accrued capital expenditures	159	199
Duke Energy Progress [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	391	362
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	570	507
Equity component of AFUDC	(17)	(33)
Community support and charitable contributions expense		20
Gains (losses) on sales of other assets	(1)	(1)
Impairment charges	(18)	22
Deferred income taxes	152	272
Accrued pension and other post-retirement benefit costs	(5)	74
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	9	(11)
Receivables	33	(75)
Receivables from affiliated companies	(7)	4
Inventory	(53)	32
Other current assets	(97)	(41)
Increase (decrease) in
Accounts payable	(67)	(168)
Accounts payable to affiliated companies	102
Taxes accrued	95	63
Other current liabilities	(46)	(75)
Other assets	(28)	(87)
Other liabilities	(23)	(77)
Net cash provided by operating activities	990	788
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(871)	(998)
Purchases of available-for-sale securities	(371)	(460)
Proceeds from sales and maturities of available-for-sale securities	351	438
Other	(25)	3
Net cash used in investing activities	(916)	(1,017)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	650	545
Payments for the redemption of long-term debt	(169)	(451)
Payments for the redemption of preferred stock		(62)
Notes payable to affiliated companies	(340)	217
Dividends or distributions to parent	(224)
Other	(6)	(6)
Net cash used in financing activities	(89)	243
Net increase in cash and cash equivalents	(15)	14
Cash and cash equivalents at beginning of period	21	18
Cash and cash equivalents at end of period	6	32
Significant non-cash transactions:
Accrued capital expenditures	107	122
Duke Energy Florida [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	455	250
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	413	240
Equity component of AFUDC	(1)	(6)
Gains (losses) on sales of other assets		(1)
Impairment charges	2	346
Deferred income taxes	194	229
Accrued pension and other post-retirement benefit costs	22	66
Contributions to qualified pension plans		(27)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	13	37
Receivables	(118)	(127)
Receivables from affiliated companies	(37)	19
Inventory	7	46
Other current assets	(90)	(132)
Increase (decrease) in
Accounts payable	32	30
Accounts payable to affiliated companies	29	(19)
Taxes accrued	68	152
Other current liabilities	(50)	203
Other assets	(92)	(128)
Other liabilities	(53)	(44)
Net cash provided by operating activities	794	1,134
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(513)	(734)
Purchases of available-for-sale securities	(238)	(1,191)
Proceeds from sales and maturities of available-for-sale securities	243	1,192
Notes receivable from affiliated companies	(182)	177
Other	(14)
Net cash used in investing activities	(704)	(556)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	225
Payments for the redemption of long-term debt	(10)	(435)
Payments for the redemption of preferred stock		(34)
Notes payable to affiliated companies	(181)
Dividends or distributions to parent	(124)	(225)
Other	(1)
Net cash used in financing activities	(91)	(694)
Net increase in cash and cash equivalents	(1)	(116)
Cash and cash equivalents at beginning of period	16	131
Cash and cash equivalents at end of period	15	15
Significant non-cash transactions:
Accrued capital expenditures	52	76
Duke Energy Ohio [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	(558)	96
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	205	268
Equity component of AFUDC	(3)
Gains (losses) on sales of other assets		(5)
Impairment charges	889
Deferred income taxes	(285)	76
Accrued pension and other post-retirement benefit costs	6	12
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	124
Receivables	(66)	(6)
Receivables from affiliated companies	62	1
Inventory	(16)	29
Other current assets	56	(8)
Increase (decrease) in
Accounts payable	(42)	(56)
Accounts payable to affiliated companies	(6)	4
Taxes accrued	13	(29)
Other current liabilities	46	10
Other assets	(8)	3
Other liabilities	(20)	(63)
Net cash provided by operating activities	397	332
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(242)	(318)
Net proceeds from the sales of equity investments and other assets		11
Notes receivable from affiliated companies	(178)	(45)
Other		1
Net cash used in investing activities	(420)	(351)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		450
Payments for the redemption of long-term debt	(406)	(257)
Notes payable to affiliated companies	520	(176)
Dividends or distributions to parent	(100)
Other	1	(2)
Net cash used in financing activities	15	15
Net increase in cash and cash equivalents	(8)	(4)
Cash and cash equivalents at beginning of period	36	31
Cash and cash equivalents at end of period	28	27
Significant non-cash transactions:
Accrued capital expenditures	21	20
Duke Energy Indiana [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	301	276
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	311	230
Equity component of AFUDC	(10)	(11)
Deferred income taxes	136	190
Accrued pension and other post-retirement benefit costs	12	19
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(31)
Receivables	(20)	15
Receivables from affiliated companies	72	(19)
Inventory	(30)	(33)
Other current assets	40	27
Increase (decrease) in
Accounts payable	(44)	(22)
Accounts payable to affiliated companies	4	(7)
Taxes accrued	(36)	16
Other current liabilities	3	(9)
Other assets	(15)	2
Other liabilities	44	(78)
Net cash provided by operating activities	768	565
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(462)	(387)
Purchases of available-for-sale securities	(17)	(7)
Proceeds from sales and maturities of available-for-sale securities	13	6
Notes receivable from affiliated companies	96	(69)
Other	4	(4)
Net cash used in investing activities	(366)	(461)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		498
Payments for the redemption of long-term debt	(2)	(403)
Notes payable to affiliated companies	61	(81)
Dividends or distributions to parent	(451)	(125)
Other	(1)	(4)
Net cash used in financing activities	(393)	(115)
Net increase in cash and cash equivalents	9	(11)
Cash and cash equivalents at beginning of period	15	36
Cash and cash equivalents at end of period	24	25
Significant non-cash transactions:
Accrued capital expenditures	$ 64	$ 36