Acquisitions and Dispositions (Tables)

6 Months Ended

Jun. 30, 2017

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

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 [Table Text Block]

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.

	Three Months Ended		Six Months Ended
(in millions)	June 30, 2016		June 30, 2016
Operating Revenues	$	5,374	$	11,214
Net Income Attributable to Duke Energy Corporation	540		1,372

Financial Statement Disclosures

The following table presents the results of the International Disposal Group, which are included in Income from Discontinued Operations, net of tax in Duke Energy's Condensed Consolidated Statements of Operations. Interest expense directly associated with the International Disposal Group was allocated to discontinued operations. No interest from corporate level debt was allocated to discontinued operations.

	Three Months Ended			Six Months Ended
(in millions)	June 30, 2016			June 30, 2016
Operating Revenues	$	270		$	516
Fuel used in electric generation and purchased power	70			117
Cost of natural gas	12			23
Operation, maintenance and other	84			155
Depreciation and amortization	22			44
Property and other taxes	2			5
Impairment charges (a)	194			194
Gains on Sales of Other Assets and Other, net	1			1
Other Income and Expenses, net	11			21
Interest Expense	22			44
Loss before income taxes	(124		)	(44		)
Income tax benefit(b)	(13		)	(52		)
(Loss) Income from discontinued operations of the International Disposal Group	(111		)	8
(Loss) Income from discontinued operations of other businesses	(1		)	2
(Loss) Income from Discontinued Operations, net of tax	$	(112	)	$	10

(a) 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 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.

(b) Includes an income tax benefit of $95 million for the six months ended June 30, 2016 related to historical undistributed foreign earnings. See Note 16 for additional information.

Duke Energy has elected not to separately disclose discontinued operations on the Condensed Consolidated Statements of Cash Flows. The following table summarizes Duke Energy's cash flows from discontinued operations related to the International Disposal Group.

	Six Months Ended
(in millions)	June 30, 2016
Cash flows provided by (used in):
Operating activities	$	144
Investing activities	(24		)