Business Segments (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting Information [Line Items]

Business Segment Data

Business segment information is presented in the following tables. Segment assets presented exclude intercompany assets.

	Three Months Ended September 30, 2018
	Electric		Gas					Total
	Utilities and		Utilities and		Commercial			Reportable
(in millions)	Infrastructure		Infrastructure		Renewables			Segments		Other			Eliminations			Consolidated
Unaffiliated revenues	$	6,253	$	232	$	127		$	6,612	$	16		$	—		$	6,628
Intersegment revenues	7		24		—			31		18			(49		)	—
Total revenues	$	6,260	$	256	$	127		$	6,643	$	34		$	(49	)	$	6,628
Segment income (loss)(a)(b)(c)	$	1,167	$	17	$	(62	)	$	1,122	$	(44	)	$	—		$	1,078
Add back noncontrolling interests																(16		)
Income from discontinued operations, net of tax																4
Net income																$	1,066
Segment assets	$	123,847	$	11,806	$	4,212		$	139,865	$	3,115		$	185		$	143,165

	Three Months Ended September 30, 2017
	Electric		Gas					Total
	Utilities and		Utilities and		Commercial			Reportable
(in millions)	Infrastructure		Infrastructure		Renewables			Segments		Other			Eliminations			Consolidated
Unaffiliated revenues	$	6,122	$	249	$	95		$	6,466	$	16		$	—		$	6,482
Intersegment revenues	7		23		—			30		19			(49		)	—
Total revenues	$	6,129	$	272	$	95		$	6,496	$	35		$	(49	)	$	6,482
Segment income (loss)(b)(d)(e)	$	1,020	$	19	$	(49	)	$	990	$	(34	)	$	—		$	956
Add back noncontrolling interests																1
Loss from discontinued operations, net of tax																(2		)
Net income																$	955

(a) All segments include adjustments to the December 31, 2017 estimate of the income tax effects of the Tax Act. See Note 17 for additional information.

(b) Other includes costs to achieve the Piedmont acquisition.

(c) Commercial Renewables includes an impairment charge related to goodwill. See Note 7 for additional information.

(d) Electric Utilities and Infrastructure includes an impairment charge related to the unrecovered Levy Nuclear Project costs at Duke Energy Florida.

(e) Commercial Renewables includes impairment charges related to certain wind projects.

	Nine Months Ended September 30, 2018
	Electric		Gas					Total
	Utilities and		Utilities and		Commercial			Reportable
(in millions)	Infrastructure		Infrastructure		Renewables			Segments		Other			Eliminations			Consolidated
Unaffiliated revenues	$	16,783	$	1,229	$	347		$	18,359	$	47		$	—		$	18,406
Intersegment revenues	23		72		—			95		54			(149		)	—
Total revenues	$	16,806	$	1,301	$	347		$	18,454	$	101		$	(149	)	$	18,406
Segment income (loss)(a)(b)(c)(d)(e)(f)	$	2,492	$	161	$	(4	)	$	2,649	$	(446	)	$	—		$	2,203
Add back noncontrolling interests																(12		)
Loss from discontinued operations, net of tax																(1		)
Net income																$	2,190

	Nine Months Ended September 30, 2017
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other			Eliminations			Consolidated
Unaffiliated revenues	$	16,211	$	1,175	$	333	$	17,719	$	47		$	—		$	17,766
Intersegment revenues	23		68		—		91		56			(147		)	—
Total revenues	$	16,234	$	1,243	$	333	$	17,810	$	103		$	(147	)	$	17,766
Segment income (loss)(c)(g)(h)	$	2,384	$	179	$	2	$	2,565	$	(205	)	$	—		$	2,360
Add back noncontrolling interests															5
Loss from discontinued operations, net of tax															(4		)
Net income															$	2,361

(a) All segments include adjustments to the December 31, 2017 estimate of the income tax effects of the Tax Act. See Note 17 for additional information.

(b) Electric Utilities and Infrastructure includes regulatory and legislative impairment charges related to rate case orders, settlements or other actions of regulators or legislative bodies. See Note 3 for additional information.

(c) Other includes costs to achieve the Piedmont acquisition.

(d) Gas Utilities and Infrastructure includes an impairment of the investment in Constitution Pipeline Company, LLC (Constitution). See Note 3 for additional information.

(e) Other includes the loss on the sale of the retired Beckjord Generating Station (Beckjord) described below and a valuation allowance recorded against the alternative minimum tax credits subject to sequestration. See Note 17 for additional information on the valuation allowance.

(f) Commercial Renewables includes an impairment charge related to goodwill. See Note 7 for additional information.

(g) Electric Utilities and Infrastructure includes an impairment charge related to the unrecovered Levy Nuclear Project costs at Duke Energy Florida.

(h) Commercial Renewables includes impairment charges related to certain wind projects.

Duke Energy Ohio [Member]

Segment Reporting Information [Line Items]

Business Segment Data

	Three Months Ended September 30, 2018
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other		Eliminations			Consolidated
Total revenues	$	373	$	84	$	457	$	12	$	—		$	469
Segment income/Net income	$	85	$	12	$	97	$	3	$	—		$	100
Segment assets	$	5,484	$	2,775	$	8,259	$	39	$	(2	)	$	8,296

	Three Months Ended September 30, 2017
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other			Consolidated
Total revenues	$	371	$	90	$	461	$	10		$	471
Segment income (loss)	$	50	$	14	$	64	$	(8	)	$	56
Loss from discontinued operations, net of tax										(1		)
Net income										$	55

	Nine Months Ended September 30, 2018
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other			Consolidated
Total revenues	$	1,055	$	361	$	1,416	$	36		$	1,452
Segment income (loss)/Net income(a)	$	157	$	64	$	221	$	(100	)	$	121

	Nine Months Ended September 30, 2017
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other			Consolidated
Total revenues	$	1,036	$	360	$	1,396	$	30		$	1,426
Segment income (loss)	$	96	$	56	$	152	$	(24	)	$	128
Loss from discontinued operations, net of tax										(1		)
Net income										$	127

(a)    Other includes the loss on the sale of Beckjord.