Business Segments (Tables)

9 Months Ended

Sep. 30, 2016

Segment Reporting Information [Line Items]

Business Segment Data

	Three Months Ended September 30, 2016
								Total
	Regulated		International		Commercial			Reportable
(in millions)	Utilities		Energy		Portfolio			Segments		Other			Eliminations			Consolidated
Unaffiliated revenues	$	6,421	$	245	$	140		$	6,806	$	15		$	—		$	6,821
Intersegment revenues	9		—		—			9		17			(26		)	—
Total revenues	$	6,430	$	245	$	140		$	6,815	$	32		$	(26	)	$	6,821
Segment income (loss)(a)(b)	$	1,200	$	64	$	(21	)	$	1,243	$	(189	)	$	—		$	1,054
Add back noncontrolling interests																5
Income from discontinued operations, net of tax(c)																122
Net income																$	1,181
Segment assets	$	114,707	$	3,153	$	4,414		$	122,274	$	7,228		$	184		$	129,686

(a) Other includes after-tax charges for costs to achieve mergers of $52 million, primarily due to interest expense related to the Piedmont acquisition financing, and cost savings initiatives of $12 million primarily due to severance costs.

(b) Commercial Portfolio includes an after-tax impairment of $45 million related to certain equity method investments in renewable energy projects. See Note 13, Variable Interest Entities, for additional information.

(c) Represents an income tax benefit resulting from deferred tax liability adjustments related to previously sold businesses. See Note 2, Acquisitions and Dispositions, for further information.

	Three Months Ended September 30, 2015
							Total
	Regulated		International		Commercial		Reportable
(in millions)	Utilities		Energy		Portfolio		Segments		Other			Eliminations			Consolidated
Unaffiliated revenues	$	6,138	$	281	$	66	$	6,485	$	(2	)	$	—		$	6,483
Intersegment revenues	9		—		—		9		19			(28		)	—
Total revenues	$	6,147	$	281	$	66	$	6,494	$	17		$	(28	)	$	6,483
Segment income (loss)(a)(b)	$	905	$	69	$	8	$	982	$	(45	)	$	—		$	937
Add back noncontrolling interests															3
Loss from discontinued operations, net of tax															(5		)
Net income															$	935

(a) Regulated Utilities includes an after-tax charge of $56 million related to the Edwardsport settlement. See Note 4 for further information.

(b) Other includes $15 million of after-tax costs to achieve the 2012 Progress Energy merger.

	Nine Months Ended September 30, 2016
							Total
	Regulated		International		Commercial		Reportable
(in millions)	Utilities		Energy		Portfolio		Segments		Other			Eliminations			Consolidated
Unaffiliated revenues	$	16,761	$	761	$	366	$	17,888	$	39		$	—		$	17,927
Intersegment revenues	27		—		—		27		52			(79		)	—
Total revenues	$	16,788	$	761	$	366	$	17,915	$	91		$	(79	)	$	17,927
Segment income (loss)(a)(b)(c)	$	2,613	$	85	$	20	$	2,718	$	(463	)	$	—		$	2,255
Add back noncontrolling interests															13
Income from discontinued operations, net of tax(d)															124
Net income															$	2,392

(a) Other includes after-tax charges for costs to achieve mergers of $195 million, primarily due to losses on forward-starting interest rate swaps related to the Piedmont acquisition, and cost savings initiatives of $39 million primarily due to severance costs. See Note 10 for additional information related to the swaps.

(b) International Energy includes an after-tax impairment charge of $145 million. See Note 2 for additional information.

(c) Commercial Portfolio includes an after-tax impairment of $45 million related to certain equity method investments in renewable energy projects. See Note 13, Variable Interest Entities, for additional information.

(d) Includes income tax benefit of $122 million resulting from deferred tax liability adjustments related to previously sold businesses. See Note 2 for further information.

	Nine Months Ended September 30, 2015
								Total
	Regulated		International		Commercial			Reportable
(in millions)	Utilities		Energy		Portfolio			Segments		Other			Eliminations			Consolidated
Unaffiliated revenues	$	17,062	$	841	$	214		$	18,117	$	20		$	—		$	18,137
Intersegment revenues	28		—		—			28		58			(86		)	—
Total revenues	$	17,090	$	841	$	214		$	18,145	$	78		$	(86	)	$	18,137
Segment income (loss)(a)(b)(c)	$	2,311	$	157	$	(15	)	$	2,453	$	(139	)	$	(4	)	$	2,310
Add back noncontrolling interests																10
Income from discontinued operations, net of tax(d)																29
Net income																$	2,349

(a) Regulated Utilities includes an after-tax charge of $56 million related to the Edwardsport settlement. Refer to Note 4 for further information.

(b)    Other includes $42 million of after-tax costs to achieve the 2012 Progress Energy merger.

(c) Commercial Portfolio includes state tax expense of $41 million, resulting from changes to state apportionment factors due to the sale of the Midwest Generation Disposal Group, that does not qualify for discontinued operations. Refer to Note 2 for further information related to the sale.

(d) Includes after-tax impact of $53 million for the settlement agreement reached in a lawsuit related to the Midwest Generation Disposal Group. Refer to Note 5 for further information related to the lawsuit.

The following table provides the amount of Other net expense.

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(in millions)	2016			2015			2016			2015
Duke Energy Carolinas	$	(16	)	$	(10	)	$	(50	)	$	(28	)
Progress Energy(a)	(45		)	(3		)	(139		)	(87		)
Duke Energy Progress	(10		)	(4		)	(26		)	(12		)
Duke Energy Florida	(5		)	(3		)	(14		)	(9		)
Duke Energy Ohio	(10		)	(12		)	(29		)	(20		)
Duke Energy Indiana	(3		)	(2		)	(10		)	(6		)

(a) Other for Progress Energy also includes interest expense on corporate debt instruments of $55 million and $166 million for the three and nine months endedSeptember 30, 2016, respectively, and $61 million and $180 million for the three and nine months endedSeptember 30, 2015, respectively.