Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Revenues [Abstract]
Regulated electric	$ 21,221	$ 21,379	$ 21,550
Nonregulated electric and other	659	456	386
Regulated natural gas	863	536	573
Total operating revenues	22,743	22,371	22,509
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power	6,625	7,355	7,732
Cost of natural gas	265	141	185
Operation, maintenance and other	6,085	5,539	5,506
Depreciation and amortization	3,294	3,053	2,969
Property and other taxes	1,142	1,129	1,204
Impairment charges	18	106	81
Total operating expenses	17,429	17,323	17,677
Gains (Losses) on Sales of Other Assets and Other, net	27	30	10
Operating Income	5,341	5,078	4,842
Other Income and Expenses [Abstract]
Equity in earnings (losses) of unconsolidated affiliates	(15)	69	130
Other income and expenses, net	324	290	320
Total other income and expenses	309	359	450
Interest Expense	1,916	1,527	1,529
Income From Continuing Operations Before Income Taxes	3,734	3,910	3,763
Income Tax Expense from Continuing Operations	1,156	1,256	1,225
Income from Continuing Operations	2,578	2,654	2,538
(Loss) Income from discontinued operations	(408)	177	(649)
Net Income	2,170	2,831	1,889
Less: Net Income Attributable to Noncontrolling Interests	18	15	6
Net Income Attributable to Parent	2,152	2,816	1,883
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Pension and OPEB adjustments	(11)	(13)	4
Reclassification into earnings from cash flow hedges	13	9	7
Unrealized gain (loss) on investments in available for sale securities	2	(6)	3
Other comprehensive income (loss), net of tax	715	(274)	(136)
Comprehensive Income (Loss)	2,885	2,557	1,753
Less: Comprehensive Income Attributable to Noncontrolling Interests	20	4	14
Comprehensive income (loss)	$ 2,865	$ 2,553	$ 1,739
Income From Continuing Operations Attributable To Parent Common Shareholders [Abstract]
Basic	$ 3.71	$ 3.80	$ 3.58
Diluted	3.71	3.80	3.58
Income (loss) from discontinued operations attributable To Duke Energy Corporation common shareholders [Abstract]
Basic	(0.60)	0.25	(0.92)
Diluted	(0.60)	0.25	(0.92)
Net income attributable to Duke Energy Corporation common shareholders [Abstract]
Basic	3.11	4.05	2.66
Diluted	$ 3.11	$ 4.05	$ 2.66
Weighted-average shares outstanding [Abstract]
Basic	691	694	707
Diluted	691	694	707
Duke Energy Carolinas [Member]
Operating Revenues [Abstract]
Total operating revenues	$ 7,322	$ 7,229	$ 7,351
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power	1,797	1,881	2,133
Operation, maintenance and other	2,106	2,066	1,995
Depreciation and amortization	1,075	1,051	1,009
Property and other taxes	276	269	316
Impairment charges	1	1	3
Total operating expenses	5,255	5,268	5,456
Gains (Losses) on Sales of Other Assets and Other, net	(5)	(1)
Operating Income	2,062	1,960	1,895
Other Income and Expenses [Abstract]
Other income and expenses, net	162	160	172
Interest Expense	424	412	407
Income From Continuing Operations Before Income Taxes	1,800	1,708	1,660
Income Tax Expense from Continuing Operations	634	627	588
Net Income Attributable to Parent	1,166	1,081	1,072
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassification into earnings from cash flow hedges	2	1	2
Unrealized gain (loss) on investments in available for sale securities		1
Other comprehensive income (loss), net of tax	2	2	2
Comprehensive income (loss)	1,168	1,083	1,074
Progress Energy [Member]
Operating Revenues [Abstract]
Total operating revenues	9,853	10,277	10,166
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power	3,644	4,224	4,195
Operation, maintenance and other	2,386	2,298	2,335
Depreciation and amortization	1,213	1,116	1,128
Property and other taxes	487	492	517
Impairment charges	7	12	(16)
Total operating expenses	7,737	8,142	8,159
Gains (Losses) on Sales of Other Assets and Other, net	25	25	11
Operating Income	2,141	2,160	2,018
Other Income and Expenses [Abstract]
Other income and expenses, net	114	97	77
Interest Expense	689	670	675
Income From Continuing Operations Before Income Taxes	1,566	1,587	1,420
Income Tax Expense from Continuing Operations	527	522	540
Income from Continuing Operations	1,039	1,065	880
(Loss) Income from discontinued operations	2	(3)	(6)
Net Income	1,041	1,062	874
Less: Net Income Attributable to Noncontrolling Interests	10	11	5
Net Income Attributable to Parent	1,031	1,051	869
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Pension and OPEB adjustments	1	(10)	9
Reclassification into earnings from cash flow hedges	8	4	8
Unrealized gain (loss) on investments in available for sale securities	1	(1)	1
Other comprehensive income (loss), net of tax	10	(7)	18
Comprehensive Income (Loss)	1,051	1,055	892
Less: Comprehensive Income Attributable to Noncontrolling Interests	10	11	5
Comprehensive income (loss)	1,041	1,044	887
Duke Energy Progress [Member]
Operating Revenues [Abstract]
Total operating revenues	5,277	5,290	5,176
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power	1,830	2,029	2,036
Operation, maintenance and other	1,504	1,452	1,470
Depreciation and amortization	703	643	582
Property and other taxes	156	140	174
Impairment charges	1	5	(18)
Total operating expenses	4,194	4,269	4,244
Gains (Losses) on Sales of Other Assets and Other, net	3	3	3
Operating Income	1,086	1,024	935
Other Income and Expenses [Abstract]
Other income and expenses, net	71	71	51
Interest Expense	257	235	234
Income From Continuing Operations Before Income Taxes	900	860	752
Income Tax Expense from Continuing Operations	301	294	285
Net Income Attributable to Parent	599	566	467
Duke Energy Florida [Member]
Operating Revenues [Abstract]
Total operating revenues	4,568	4,977	4,975
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power	1,814	2,195	2,158
Operation, maintenance and other	865	835	850
Depreciation and amortization	509	473	545
Property and other taxes	333	352	343
Impairment charges	6	7	2
Total operating expenses	3,527	3,862	3,898
Gains (Losses) on Sales of Other Assets and Other, net			1
Operating Income	1,041	1,115	1,078
Other Income and Expenses [Abstract]
Other income and expenses, net	44	24	20
Interest Expense	212	198	201
Income From Continuing Operations Before Income Taxes	873	941	897
Income Tax Expense from Continuing Operations	322	342	349
Net Income Attributable to Parent	551	599	548
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassification into earnings from cash flow hedges			1
Unrealized gain (loss) on investments in available for sale securities	1
Other comprehensive income (loss), net of tax	1	0	1
Comprehensive income (loss)	552	599	549
Duke Energy Ohio [Member]
Operating Revenues [Abstract]
Regulated electric	1,410	1,331	1,316
Nonregulated electric and other	31	33	19
Regulated natural gas	503	541	578
Total operating revenues	1,944	1,905	1,913
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power	442	446	459
Fuel used in electric generation and purchased power - nonregulated	51	47	25
Cost of natural gas	103	141	185
Operation, maintenance and other	512	495	516
Depreciation and amortization	233	227	214
Property and other taxes	258	254	234
Impairment charges			94
Total operating expenses	1,599	1,610	1,727
Gains (Losses) on Sales of Other Assets and Other, net	2	8	1
Operating Income	347	303	187
Other Income and Expenses [Abstract]
Other income and expenses, net	9	6	10
Interest Expense	86	79	86
Income From Continuing Operations Before Income Taxes	270	230	111
Income Tax Expense from Continuing Operations	78	81	43
Income from Continuing Operations	192	149	68
(Loss) Income from discontinued operations	36	23	(563)
Net Income Attributable to Parent	228	172	(495)
Duke Energy Indiana [Member]
Operating Revenues [Abstract]
Total operating revenues	2,958	2,890	3,175
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power	909	982	1,259
Operation, maintenance and other	723	682	670
Depreciation and amortization	496	434	413
Property and other taxes	58	61	128
Impairment charges	8	88
Total operating expenses	2,194	2,247	2,470
Gains (Losses) on Sales of Other Assets and Other, net	1	1
Operating Income	765	644	705
Other Income and Expenses [Abstract]
Other income and expenses, net	22	11	22
Interest Expense	181	176	171
Income From Continuing Operations Before Income Taxes	606	479	556
Income Tax Expense from Continuing Operations	225	163	197
Net Income Attributable to Parent	381	316	359
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassification into earnings from cash flow hedges	(1)	(2)
Other comprehensive income (loss), net of tax	(1)	(2)
Comprehensive income (loss)	$ 380	$ 314	$ 359