Acquisitions and Dispositions (Tables)

12 Months Ended

Dec. 31, 2017

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired

The purchase price allocation of the Piedmont acquisition is as follows:

(in millions)
Current assets	$	497
Property, plant and equipment, net	4,714
Goodwill	3,353
Other long-term assets	804
Total assets	9,368
Current liabilities, including current maturities of long-term debt	576
Long-term liabilities	1,790
Long-term debt	2,002
Total liabilities	4,368
Total purchase price	$	5,000

Business Acquisition, Pro Forma Information

This information has been presented for illustrative purposes only and is not necessarily indicative of the consolidated results of operations that would have been achieved or the future consolidated results of operations of Duke Energy.

	Years Ended December 31,
(in millions)	2016		2015
Operating Revenues	$	23,504	$	23,570
Net Income Attributable to Duke Energy Corporation	2,442		2,877

Disposal Groups, Including Discontinued Operations

The following table summarizes the Midwest Generation Disposal Group activity recorded within discontinued operations.

	Duke Energy						Duke Energy Ohio
	Years Ended December 31,						Years Ended December 31,
(in millions)	2016			2015			2016			2015
Operating Revenues	$	—		$	543		$	—		$	412
Pretax Loss on disposal(a)	—			(45		)	—			(52		)
Income (loss) before income taxes(b)	$	—		$	59		$	—		$	44
Income tax (benefit) expense(c)	(36		)	26			(36		)	21
Income (loss) from discontinued operations	$	36		$	33		$	36		$	23

(a) The Loss on disposal includes impairments recorded to adjust the carrying amount of the assets to the estimated fair value of the business, based on the selling price to Dynegy less cost to sell.

(b) 2015 amounts include the impact of an $81 million charge for the settlement agreement reached in a lawsuit related to the Midwest Generation Disposal Group. Refer to Note 5 for further information about the lawsuit.

(c) 2016 amounts result from immaterial out of period deferred tax liability adjustments.

The following table summarizes the (Loss) Income from Discontinued Operations, net of tax recorded on Duke Energy's Consolidated Statements of Operations for the years ended December 31, 2016, and 2015:

	Years Ended December 31,
(in millions)	2016			2015
International Energy Disposal Group	$	(534	)	$	157
Midwest Generation Disposal Group	36			33
Other(a)	90			(13		)
(Loss) Income from Discontinued Operations, net of tax	$	(408	)	$	177

(a) Relates to previously sold businesses not related to the Disposal Groups. The amount for 2016 represents an income tax benefit resulting from immaterial out of period deferred tax liability adjustments. The amount for 2015 includes indemnifications provided for certain legal, tax and environmental matters and foreign currency translation adjustments.

The following table presents the results of the International Disposal Group for the years ended December 31, 2016, and 2015, which are included in (Loss) Income from Discontinued Operations, net of tax in Duke Energy's Consolidated Statements of Operations.

	Years Ended December 31,
(in millions)	2016			2015
Operating Revenues	$	988		$	1,088
Fuel used in electric generation and purchased power	227			306
Cost of natural gas	43			53
Operation, maintenance and other	341			334
Depreciation and amortization(a)	62			92
Property and other taxes	15			7
Impairment charges (b)	194			13
(Loss) Gains on Sales of Other Assets and Other, net	(3		)	6
Other Income and Expenses, net	58			23
Interest Expense	82			85
Pretax loss on disposal(c)	(514		)	—
(Loss) Income before income taxes(d)	(435		)	227
Income tax expense(e)(f)	99			70
(Loss) Income from discontinued operations of the International Disposal Group	$	(534	)	$	157

(a) Upon meeting the criteria for assets held for sale, beginning in the fourth quarter of 2016 depreciation expense was ceased.

(b) In conjunction with the advancements of marketing efforts during 2016, Duke Energy performed recoverability tests of the long-lived asset groups of International Energy. As a result, Duke Energy determined the carrying value of certain assets in Central America was not fully recoverable and recorded a pretax impairment charge of $194 million. The charge represents the excess of carrying value over the estimated fair value of the assets, which was based on a Level 3 Fair Value measurement that was primarily determined from the income approach using discounted cash flows but also considered market information obtained in 2016.

(c) The pretax loss on disposal includes the recognition of cumulative foreign currency translation losses of $620 million as of the disposal date. See the Consolidated Statements of Changes in Equity for additional information.

(d) Pretax (Loss) Income attributable to Duke Energy Corporation was $(445) million and $221 million for the years ended December 31, 2016 and 2015, respectively.

(e) 2016 amount includes $126 million of income tax expense on the disposal, which primarily reflects in-country taxes incurred as a result of the sale. The after-tax loss on disposal was $640 million.

(f) 2016 amount includes an income tax benefit of $95 million. See Note 22, "Income Taxes," for additional information.

Schedule of Cash Flow, Supplemental Disclosures

The following table summarizes Duke Energy's cash flows from discontinued operations related to the International Disposal Group.

	Years Ended December 31,
(in millions)	2016			2015
Cash flows provided by (used in):
Operating activities	$	204		$	248
Investing activities	(434		)	177