Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 2,349	$ 1,789
Net Income (Loss) Attributable to Parent	2,339	1,786
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	2,680	2,641
Equity component of AFUDC	(123)	(99)
Gains on sales of other assets	(44)	(27)
Impairment charges	145	848
Deferred income taxes	1,104	562
Equity in earnings of unconsolidated affiliates	(53)	(97)
Accrued pension and other post-retirement benefit costs	53	81
Contributions to pension plans	(143)
Payments for asset retirement obligations	(208)	(52)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(23)	128
Receivables	67	(24)
Inventory	(13)	(17)
Other current assets	(119)	(315)
Increase (decrease) in
Accounts payable	(182)	(303)
Taxes accrued	41	37
Other current liabilities	79	(99)
Other assets	(143)	(100)
Other liabilities	(71)	214
Net cash provided by operating activities	5,396	5,167
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(4,642)	(3,755)
Investment expenditures	(209)	(65)
Acquisitions	(1,317)	(16)
Purchases of available-for-sale securities	(3,017)	(2,424)
Proceeds from sales and maturities of available-for-sale securities	3,037	2,445
Net proceeds from the sale of Midwest generation business and sales of equity investments and other assets	2,916	172
Change in restricted cash	(49)	(15)
Other	(10)	(76)
Net cash used in investing activities	(3,291)	(3,734)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,780	2,217
Proceeds from the issuance of common stock related to employee benefit plans	16	24
Payments for the redemption of long-term debt	(1,264)	(2,503)
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	(931)
Notes payable and commercial paper	531	941
Distributions to noncontrolling interests	(7)	(45)
Dividends paid	(1,685)	(1,670)
Repurchase of common shares	(1,500)
Other	2	33
Net cash used in financing activities	(2,771)	(1,003)
Net (decrease) increase in cash and cash equivalents	(666)	430
Cash and cash equivalents at beginning of period	2,036	1,501
Cash and cash equivalents at end of period	1,370	1,931
Significant non-cash transactions:
Accrued capital expenditures	610	466
Duke Energy Carolinas [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	940	933
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,016	952
Equity component of AFUDC	(73)	(68)
Impairment charges		3
Deferred income taxes	183	47
Accrued pension and other post-retirement benefit costs	11	16
Contributions to pension plans	(42)
Payments for asset retirement obligations	(104)
(Increase) decrease in
Receivables	(9)	5
Receivable from affiliated companies		(42)
Inventory	(48)	91
Other current assets	42	(130)
Increase (decrease) in
Accounts payable	(141)	(167)
Accounts payable to affiliated companies	(11)	15
Taxes accrued	182	173
Other current liabilities	49	7
Other assets	97	23
Other liabilities	(61)	21
Net cash provided by operating activities	2,031	1,879
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,372)	(1,289)
Purchases of available-for-sale securities	(1,926)	(1,533)
Proceeds from sales and maturities of available-for-sale securities	1,926	1,516
Notes receivable from affiliated companies	(549)	(117)
Other	(13)	(27)
Net cash used in investing activities	(1,934)	(1,450)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	496
Payments for the redemption of long-term debt	(3)	(42)
Distributions to parent	(401)	(376)
Other	(4)
Net cash used in financing activities	88	(418)
Net (decrease) increase in cash and cash equivalents	185	11
Cash and cash equivalents at beginning of period	13	23
Cash and cash equivalents at end of period	198	34
Significant non-cash transactions:
Accrued capital expenditures	229	177
Progress Energy [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	931	735
Net Income (Loss) Attributable to Parent	923	733
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	962	985
Equity component of AFUDC	(40)	(18)
Gains on sales of other assets	(24)	1
Impairment charges	7	(16)
Deferred income taxes	512	231
Accrued pension and other post-retirement benefit costs	(4)	20
Contributions to pension plans	(42)
Payments for asset retirement obligations	(90)	(52)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	6	28
Receivables	(103)	(162)
Receivable from affiliated companies	(62)	(32)
Inventory	44	(45)
Other current assets	298	(147)
Increase (decrease) in
Accounts payable	(157)	(73)
Accounts payable to affiliated companies	35	142
Taxes accrued	75	166
Other current liabilities	115	(96)
Other assets	(116)	(126)
Other liabilities	(87)	43
Net cash provided by operating activities	2,260	1,584
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,816)	(1,383)
Acquisitions	(1,249)
Purchases of available-for-sale securities	(829)	(609)
Proceeds from sales and maturities of available-for-sale securities	895	594
Proceeds from the Sale of Nuclear Fuel	81
Notes receivable from affiliated companies	(31)	(89)
Other	(44)	(37)
Net cash used in investing activities	(2,993)	(1,524)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,195	875
Payments for the redemption of long-term debt	(555)	(479)
Notes payable to affiliated companies	(401)	(391)
Distributions to noncontrolling interests	(4)	(37)
Capital contribution from parent	625
Other	(11)	(39)
Net cash used in financing activities	849	(71)
Net (decrease) increase in cash and cash equivalents	116	(11)
Cash and cash equivalents at beginning of period	42	58
Cash and cash equivalents at end of period	158	47
Significant non-cash transactions:
Accrued capital expenditures	276	159
Duke Energy Progress [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	497	391
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	587	570
Equity component of AFUDC	(35)	(17)
Gains on sales of other assets	(5)	(1)
Impairment charges		(18)
Deferred income taxes	308	152
Accrued pension and other post-retirement benefit costs	(11)	(5)
Contributions to pension plans	(21)
Payments for asset retirement obligations	(53)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(3)	9
Receivables	(51)	33
Receivable from affiliated companies	4	(7)
Inventory	37	(53)
Other current assets	187	(97)
Increase (decrease) in
Accounts payable	(69)	(67)
Accounts payable to affiliated companies	21	102
Taxes accrued	34	95
Other current liabilities	22	(46)
Other assets	(41)	(28)
Other liabilities	(64)	(23)
Net cash provided by operating activities	1,344	990
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,120)	(871)
Acquisitions	(1,249)
Purchases of available-for-sale securities	(511)	(371)
Proceeds from sales and maturities of available-for-sale securities	488	351
Notes receivable from affiliated companies	(70)
Other	(35)	(25)
Net cash used in investing activities	(2,497)	(916)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,195	650
Payments for the redemption of long-term debt	(544)	(169)
Notes payable to affiliated companies		(340)
Dividends to parent		(224)
Capital contribution from parent	625
Other	(9)	(6)
Net cash used in financing activities	1,267	(89)
Net (decrease) increase in cash and cash equivalents	114	(15)
Cash and cash equivalents at beginning of period	9	21
Cash and cash equivalents at end of period	123	6
Significant non-cash transactions:
Accrued capital expenditures	136	107
Duke Energy Florida [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	494	455
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	373	413
Equity component of AFUDC	(4)	(1)
Impairment charges	7	2
Deferred income taxes	341	194
Accrued pension and other post-retirement benefit costs	4	22
Contributions to pension plans	(21)
Payments for asset retirement obligations	(37)	(52)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	3	13
Receivables	(52)	(118)
Receivable from affiliated companies	(58)	(37)
Inventory	7	7
Other current assets	78	(90)
Increase (decrease) in
Accounts payable	(88)	32
Accounts payable to affiliated companies	10	29
Taxes accrued	43	68
Other current liabilities	97	(50)
Other assets	(73)	(92)
Other liabilities	(29)	(1)
Net cash provided by operating activities	1,095	794
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(696)	(513)
Purchases of available-for-sale securities	(318)	(238)
Proceeds from sales and maturities of available-for-sale securities	408	243
Proceeds from the Sale of Nuclear Fuel	81
Notes receivable from affiliated companies		(182)
Other	(12)	(14)
Net cash used in investing activities	(537)	(704)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		225
Payments for the redemption of long-term debt	(11)	(10)
Notes payable to affiliated companies	161	(181)
Dividends to parent	(350)	(124)
Distributions to parent	(350)
Other		(1)
Net cash used in financing activities	(550)	(91)
Net (decrease) increase in cash and cash equivalents	8	(1)
Cash and cash equivalents at beginning of period	8	16
Cash and cash equivalents at end of period	16	15
Significant non-cash transactions:
Accrued capital expenditures	140	52
Duke Energy Ohio [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	129	(558)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	175	205
Equity component of AFUDC	(2)	(3)
Gains on sales of other assets	(8)
Impairment charges	40	889
Deferred income taxes	127	(285)
Accrued pension and other post-retirement benefit costs	7	6
Contributions to pension plans	(4)
Payments for asset retirement obligations	(2)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(11)	124
Receivables	8	(66)
Receivable from affiliated companies	46	62
Inventory	2	(16)
Other current assets	6	56
Increase (decrease) in
Accounts payable	7	(42)
Accounts payable to affiliated companies	(32)	(6)
Taxes accrued	(58)	13
Other current liabilities	101	46
Other assets	28	(8)
Other liabilities	(57)	(20)
Net cash provided by operating activities	502	397
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(266)	(242)
Notes receivable from affiliated companies	145	(178)
Other	(9)
Net cash used in investing activities	(130)	(420)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments for the redemption of long-term debt	(153)	(406)
Notes payable to affiliated companies	(64)	520
Dividends to parent	(149)	(100)
Other	(2)	1
Net cash used in financing activities	(368)	15
Net (decrease) increase in cash and cash equivalents	4	(8)
Cash and cash equivalents at beginning of period	20	36
Cash and cash equivalents at end of period	24	28
Significant non-cash transactions:
Accrued capital expenditures	24	21
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	222	301
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	323	311
Equity component of AFUDC	(9)	(10)
Impairment charges	85
Deferred income taxes	276	136
Accrued pension and other post-retirement benefit costs	10	12
Contributions to pension plans	(9)
Payments for asset retirement obligations	(12)
(Increase) decrease in
Receivables	(5)	(20)
Receivable from affiliated companies	43	72
Inventory	(27)	(30)
Other current assets	67	40
Increase (decrease) in
Accounts payable	11	(44)
Accounts payable to affiliated companies	(8)	4
Taxes accrued	(11)	(36)
Other current liabilities	16	3
Other assets	(50)	(15)
Other liabilities	(1)	44
Net cash provided by operating activities	921	768
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(506)	(462)
Purchases of available-for-sale securities	(5)	(17)
Proceeds from sales and maturities of available-for-sale securities	8	13
Net proceeds from the sale of Midwest generation business and sales of equity investments and other assets	14
Notes receivable from affiliated companies	(166)	96
Other	13	4
Net cash used in investing activities	(642)	(366)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments for the redemption of long-term debt	(2)	(2)
Notes payable to affiliated companies	(71)	61
Dividends to parent	(150)	(451)
Other		(1)
Net cash used in financing activities	(223)	(393)
Net (decrease) increase in cash and cash equivalents	56	9
Cash and cash equivalents at beginning of period	6	15
Cash and cash equivalents at end of period	62	24
Significant non-cash transactions:
Accrued capital expenditures	$ 46	$ 64