Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating Revenues
Regulated electric	$ 6,303	$ 6,017	$ 16,321	$ 16,564
Nonregulated electric and other	429	377	1,251	1,157
Regulated natural gas	89	89	355	416
Total operating revenues	6,821	6,483	17,927	18,137
Operating Expenses
Fuel used in electric generation and purchased power – regulated	2,016	2,113	5,102	5,775
Fuel used in electric generation and purchased power – nonregulated	75	61	215	283
Cost of natural gas	17	21	98	158
Operation, maintenance and other	1,547	1,426	4,467	4,274
Depreciation and amortization	837	774	2,464	2,341
Property and other taxes	303	293	893	836
Impairment charges	10	111	208	111
Total operating expenses	4,805	4,799	13,447	13,778
Gains (Losses) on Sales of Other Assets and Other, net	6	4	20	31
Operating Income	2,022	1,688	4,500	4,390
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates	(60)	17	(37)	53
Other income and expenses, net	99	57	270	203
Total other income and expenses	39	74	233	256
Interest Expense	482	402	1,493	1,208
Income From Continuing Operations Before Income Taxes	1,579	1,360	3,240	3,438
Income Tax Expense from Continuing Operations	520	420	972	1,118
Income from Continuing Operations	1,059	940	2,268	2,320
Income (Loss) From Discontinued Operations, net of tax	122	(5)	124	29
Net income	1,181	935	2,392	2,349
Less: Net Income Attributable to Noncontrolling Interests	5	3	13	10
Net Income (Loss) Attributable to Parent	1,176	932	2,379	2,339
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments		(3)	2	(1)
Reclassification into earnings from cash flow hedges	1	1	3	6
Unrealized (losses) gains on available-for-sale securities		(2)	7	(5)
Other Comprehensive Income, net of tax	(5)	(135)	88	(245)
Comprehensive Income	1,176	800	2,480	2,104
Less: Comprehensive Income Attributable to Noncontrolling Interests	4	(2)	16
Comprehensive Income Attributable to Parent	$ 1,172	$ 802	$ 2,464	$ 2,104
Income from continuing operations attributable to Duke Energy Corporation common stockholders
Basic (usd per share)	$ 1.52	$ 1.36	$ 3.27	$ 3.31
Diluted (usd per share)	1.52	1.36	3.26	3.31
Income (Loss) from discontinued operations attributable to Duke Energy Corporation common stockholders
Basic (usd per share)	0.18	(0.01)	0.18	0.05
Diluted (usd per share)	0.18	(0.01)	0.18	0.05
Net income attributable to Duke Energy Corporation common stockholders
Basic (usd per share)	1.70	1.35	3.45	3.36
Diluted (usd per share)	$ 1.70	$ 1.35	$ 3.44	$ 3.36
Weighted average shares outstanding
Basic (shares)	689	688	689	696
Diluted (shares)	691	688	690	696
Duke Energy Carolinas [Member]
Operating Revenues
Total operating revenues	$ 2,226	$ 2,061	$ 5,641	$ 5,669
Operating Expenses
Fuel used in electric generation and purchased power – regulated	581	548	1,391	1,553
Operation, maintenance and other	493	511	1,481	1,469
Depreciation and amortization	268	269	802	779
Property and other taxes	68	67	206	204
Total operating expenses	1,410	1,395	3,880	4,005
Gains (Losses) on Sales of Other Assets and Other, net	(1)	0	(1)
Operating Income	815	666	1,760	1,664
Other Income and Expenses
Other income and expenses, net	39	42	121	125
Interest Expense	102	105	316	313
Income From Continuing Operations Before Income Taxes	752	603	1,565	1,476
Income Tax Expense from Continuing Operations	258	220	539	536
Net Income (Loss) Attributable to Parent	494	383	1,026	940
Other Comprehensive Income (Loss), net of tax
Reclassification into earnings from cash flow hedges		1	1	1
Unrealized (losses) gains on available-for-sale securities		1		1
Other Comprehensive Income, net of tax		2	1	2
Comprehensive Income Attributable to Parent	494	385	1,027	942
Progress Energy [Member]
Operating Revenues
Total operating revenues	2,965	2,929	7,645	7,941
Operating Expenses
Fuel used in electric generation and purchased power – regulated	1,120	1,238	2,832	3,273
Operation, maintenance and other	582	539	1,699	1,672
Depreciation and amortization	318	261	904	831
Property and other taxes	136	132	375	367
Impairment charges	1	7	4	7
Total operating expenses	2,157	2,177	5,814	6,150
Gains (Losses) on Sales of Other Assets and Other, net	6	4	18	18
Operating Income	814	756	1,849	1,809
Other Income and Expenses
Other income and expenses, net	31	17	79	63
Interest Expense	177	170	497	504
Income From Continuing Operations Before Income Taxes	668	603	1,431	1,368
Income Tax Expense from Continuing Operations	219	151	496	435
Income from Continuing Operations	449	452	935	933
Income (Loss) From Discontinued Operations, net of tax		(1)		(2)
Net income	449	451	935	931
Less: Net Income Attributable to Noncontrolling Interests	3	3	8	8
Net Income (Loss) Attributable to Parent	446	448	927	923
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	0	(3)	2	(1)
Reclassification into earnings from cash flow hedges	1	3	4	2
Unrealized (losses) gains on available-for-sale securities	1	0	2	(1)
Other Comprehensive Income, net of tax	2	0	8
Comprehensive Income	451	451	943	931
Less: Comprehensive Income Attributable to Noncontrolling Interests	3	3	8	8
Comprehensive Income Attributable to Parent	448	448	935	923
Duke Energy Progress [Member]
Operating Revenues
Total operating revenues	1,583	1,488	4,103	4,130
Operating Expenses
Fuel used in electric generation and purchased power – regulated	569	584	1,441	1,608
Operation, maintenance and other	360	329	1,067	1,066
Depreciation and amortization	176	147	526	462
Property and other taxes	40	35	119	102
Impairment charges	1		1
Total operating expenses	1,146	1,095	3,154	3,238
Gains (Losses) on Sales of Other Assets and Other, net	1	1	2	2
Operating Income	438	394	951	894
Other Income and Expenses
Other income and expenses, net	18	14	47	49
Interest Expense	61	59	188	175
Income From Continuing Operations Before Income Taxes	395	349	810	768
Income Tax Expense from Continuing Operations	124	120	271	271
Net Income (Loss) Attributable to Parent	271	229	539	497
Duke Energy Florida [Member]
Operating Revenues
Total operating revenues	1,381	1,436	3,538	3,803
Operating Expenses
Fuel used in electric generation and purchased power – regulated	550	654	1,391	1,665
Operation, maintenance and other	219	208	623	598
Depreciation and amortization	142	113	378	369
Property and other taxes	96	97	256	265
Impairment charges	1	7	4	7
Total operating expenses	1,008	1,079	2,652	2,904
Operating Income	373	357	886	899
Other Income and Expenses
Other income and expenses, net	11	2	30	12
Interest Expense	62	50	143	149
Income From Continuing Operations Before Income Taxes	322	309	773	762
Income Tax Expense from Continuing Operations	116	93	286	268
Net Income (Loss) Attributable to Parent	206	216	487	494
Other Comprehensive Income (Loss), net of tax
Unrealized (losses) gains on available-for-sale securities	1		2
Other Comprehensive Income, net of tax			2
Comprehensive Income Attributable to Parent	207	216	489	494
Duke Energy Ohio [Member]
Operating Revenues
Regulated electric	390	367	1,053	1,005
Nonregulated electric and other	10	6	22	29
Regulated natural gas	89	89	358	419
Total operating revenues	489	462	1,433	1,453
Operating Expenses
Fuel used in electric generation and purchased power – regulated	129	128	340	350
Fuel used in electric generation and purchased power – nonregulated	14	10	37	36
Cost of natural gas	6	7	64	116
Operation, maintenance and other	126	124	367	370
Depreciation and amortization	50	57	175	172
Property and other taxes	59	60	195	187
Total operating expenses	384	386	1,178	1,231
Gains (Losses) on Sales of Other Assets and Other, net	1		2	8
Operating Income	106	76	257	230
Other Income and Expenses
Other income and expenses, net	3		6	(2)
Interest Expense	22	20	63	58
Income From Continuing Operations Before Income Taxes	87	56	200	170
Income Tax Expense from Continuing Operations	32	22	65	64
Income from Continuing Operations	55	34	135	106
Income (Loss) From Discontinued Operations, net of tax	34	(2)	36	23
Net Income (Loss) Attributable to Parent	89	32	171	129
Duke Energy Indiana [Member]
Operating Revenues
Total operating revenues	809	749	2,225	2,223
Operating Expenses
Fuel used in electric generation and purchased power – regulated	242	250	690	779
Operation, maintenance and other	175	164	526	525
Depreciation and amortization	123	109	345	320
Property and other taxes	22	23	67	41
Impairment charges	8	85	8	85
Total operating expenses	570	631	1,636	1,750
Gains (Losses) on Sales of Other Assets and Other, net		(1)
Operating Income	239	117	589	473
Other Income and Expenses
Other income and expenses, net	5		15	9
Interest Expense	45	44	136	132
Income From Continuing Operations Before Income Taxes	199	73	468	350
Income Tax Expense from Continuing Operations	70	27	159	128
Net Income (Loss) Attributable to Parent	129	46	309	222
Other Comprehensive Income (Loss), net of tax
Reclassification into earnings from cash flow hedges		(1)	(1)	(2)
Other Comprehensive Income, net of tax			(1)	(2)
Comprehensive Income Attributable to Parent	$ 129	$ 45	$ 308	$ 220