Quarterly Financial Data (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	$ 5,577	$ 6,576	$ 5,213	$ 5,377	$ 5,075	$ 6,202	$ 5,302	$ 5,792	$ 22,743	$ 22,371	$ 22,509
Operating income (loss)	888	1,954	1,259	1,240	890	1,606	1,192	1,390	5,341	5,078	4,842
Income (loss) from continuing operations	376	1,001	624	577	433	890	576	755	2,578	2,654	2,538
Income (Loss) From Discontinued Operations, net of tax	(598)	180	(112)	122	49	45	(29)	112	(408)	177	(649)
Net Income (Loss)	(222)	1,181	512	699	482	935	547	867	2,170	2,831	1,889
Net Income (Loss) Attributable to Parent	$ (227)	$ 1,176	$ 509	$ 694	$ 477	$ 932	$ 543	$ 864	$ 2,152	$ 2,816	$ 1,883
Income (loss) from continuing operations attributable to Duke Energy Corporation common shareholders [Abstract]
Basic	$ 0.53	$ 1.44	$ 0.90	$ 0.83	$ 0.62	$ 1.29	$ 0.83	$ 1.06	$ 3.71	$ 3.80	$ 3.58
Diluted	0.53	1.44	0.90	0.83	0.62	1.29	0.83	1.06	3.71	3.80	3.58
Income (loss) from discontinued operations attributable To Duke Energy Corporation common shareholders [Abstract]
Basic	(0.86)	0.26	(0.16)	0.18	0.07	0.06	(0.05)	0.16	(0.60)	0.25	(0.92)
Diluted	(0.86)	0.26	(0.16)	0.18	0.07	0.06	(0.05)	0.16	(0.60)	0.25	(0.92)
Net income attributable to Duke Energy Corporation common shareholders [Abstract]
Basic	(0.33)	1.70	0.74	1.01	0.69	1.35	0.78	1.22	3.11	4.05	2.66
Diluted	$ (0.33)	$ 1.70	$ 0.74	$ 1.01	$ 0.69	$ 1.35	$ 0.78	$ 1.22	$ 3.11	$ 4.05	$ 2.66
Duke Energy Carolinas [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	$ 1,681	$ 2,226	$ 1,675	$ 1,740	$ 1,560	$ 2,061	$ 1,707	$ 1,901	$ 7,322	$ 7,229	$ 7,351
Operating income (loss)	302	815	464	481	296	666	483	515	2,062	1,960	1,895
Net Income (Loss) Attributable to Parent	140	494	261	271	141	383	265	292	1,166	1,081	1,072
Progress Energy [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	2,208	2,965	2,348	2,332	2,336	2,929	2,476	2,536	9,853	10,277	10,166
Operating income (loss)	292	814	560	475	351	756	504	549	2,141	2,160	2,018
Income (loss) from continuing operations	104	449	274	212	132	452	217	264	1,039	1,065	880
Income (Loss) From Discontinued Operations, net of tax									2	(3)	(6)
Net Income (Loss)	106	449	274	212	131	451	217	263	1,041	1,062	874
Net Income (Loss) Attributable to Parent	104	446	272	209	128	448	215	260	1,031	1,051	869
Duke Energy Progress [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	1,174	1,583	1,213	1,307	1,160	1,488	1,193	1,449	5,277	5,290	5,176
Operating income (loss)	135	438	255	258	130	394	184	316	1,086	1,024	935
Net Income (Loss) Attributable to Parent	60	271	131	137	69	229	85	183	599	566	467
Duke Energy Florida [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	1,030	1,381	1,133	1,024	1,174	1,436	1,281	1,086	4,568	4,977	4,975
Operating income (loss)	155	373	300	213	216	357	315	227	1,041	1,115	1,078
Net Income (Loss) Attributable to Parent	64	206	171	110	105	216	165	113	551	599	548
Duke Energy Ohio [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	511	489	428	516	452	462	405	586	1,944	1,905	1,913
Operating income (loss)	90	106	55	96	73	76	43	111	347	303	187
Income (loss) from continuing operations									192	149	68
Income (Loss) From Discontinued Operations, net of tax		34		2		(2)	(65)	90	36	23	(563)
Net Income (Loss) Attributable to Parent	57	89	23	59	43	32	(52)	149	228	172	(495)
Duke Energy Indiana [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	733	809	702	714	667	749	686	788	2,958	2,890	3,175
Operating income (loss)	176	239	174	176	171	117	146	210	765	644	705
Net Income (Loss) Attributable to Parent	$ 72	$ 129	$ 85	$ 95	$ 94	$ 46	$ 68	$ 108	$ 381	$ 316	$ 359