Business Segments (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2018
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other			Eliminations			Consolidated
Unaffiliated revenues	$	5,315	$	702	$	101	$	6,118	$	17		$	—		$	6,135
Intersegment revenues	8		25		—		33		18			(51		)	—
Total revenues	$	5,323	$	727	$	101	$	6,151	$	35		$	(51	)	$	6,135
Segment income (loss)(a)(b)(c)	$	750	$	116	$	20	$	886	$	(266	)	$	—		$	620
Add back noncontrolling interests															2
Net income															$	622
Segment assets	$	120,021	$	11,396	$	4,265	$	135,682	$	2,682		$	177		$	138,541

	Three Months Ended March 31, 2017
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other			Eliminations			Consolidated
Unaffiliated revenues	$	4,939	$	648	$	128	$	5,715	$	14		$	—		$	5,729
Intersegment revenues	8		22		—		30		19			(49		)	—
Total revenues	$	4,947	$	670	$	128	$	5,745	$	33		$	(49	)	$	5,729
Segment income (loss)	$	635	$	133	$	25	$	793	$	(77	)	$	—		$	716
Add back noncontrolling interests															1
Net income															$	717

(a) Electric Utilities and Infrastructure includes regulatory charges related to NCUC orders and settlements. See Note 3 for additional information.

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

(c) 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 16 for additional information on the valuation allowance.

Duke Energy Ohio [Member]

Segment Reporting Information [Line Items]

Business Segment Data

	Three Months Ended March 31, 2018
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other			Eliminations			Consolidated
Total revenues	$	336	$	174	$	510	$	14		$	—		$	524
Segment income (loss)/Net income (loss)(a)	33		34		67		(92		)	—			(25		)
Segment assets	$	5,165	$	2,709	$	7,874	$	25		$	(3	)	$	7,896

	Three Months Ended March 31, 2017
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other			Consolidated
Total revenues	$	337	$	170	$	507	$	11		$	518
Segment income (loss)/Net income (loss)	24		26		50		(8		)	42

(a) Other includes the loss on the sale of the retired Beckjord generating station described above.