Termination fee due from the acquiree.

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Termination fee payable by acquirer.

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Segment Carrying Value

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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The number of issuer's shares to which the forward contract is indexed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Amount of acquisition adjustments included in property, plant and equipment (PPE) for utilities.

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Amount of cumulative translation gain (loss), after tax, from translating foreign currency financial statements into the reporting currency.

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Acquisitions and Dispositions (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2016	Aug. 01, 2016	Feb. 22, 2016	Dec. 31, 2015
Significant Acquisitions and Disposals [Abstract]
Payments to acquire businesses				$ 29
Goodwill	$ 16,357		$ 16,357					$ 16,343
Asset Impairment Charges	195		198
Piedmont Natural Gas [Member]
Significant Acquisitions and Disposals [Abstract]
Forward starting interest rate swaps, notional	$ 1,400		$ 1,400
Shares offered	10.6		10.6
Bridge Facility	$ 4,900		$ 4,900
Bridge Facility, Remaining Borrowing Capacity	3,200		3,200
Acquirer Termination Fee	250		250
Acquiree Termination Fee	125		125
Duke Energy Progress [Member] \| NCEMPA Generating Assets [Member]
Significant Acquisitions and Disposals [Abstract]
Payments to acquire businesses		$ 1,250
Acquisition adjustment, recorded within property, plant and equipment		$ 350
Duke Energy Ohio [Member]
Significant Acquisitions and Disposals [Abstract]
Goodwill	920		920					$ 920
Duke Energy Ohio [Member] \| Midwest Generation Business [Member]
Significant Acquisitions and Disposals [Abstract]
Proceeds from sale of business				$ 2,800
International Energy [Member]
Significant Acquisitions and Disposals [Abstract]
Asset Impairment Charges			194
Segment Carrying Value	2,400		2,400
Currency Translation Adjustment	$ 589		$ 589
Term Loan Facility [Member]
Significant Acquisitions and Disposals [Abstract]
Bridge Facility							$ 1,000
Scenario, Forecast [Member] \| Piedmont Natural Gas [Member]
Significant Acquisitions and Disposals [Abstract]
Payments to acquire businesses					$ 4,900
Long-term debt assumed					2,000
Goodwill					$ 3,500
Subsequent Event [Member] \| Term Loan Facility [Member] \| Piedmont Natural Gas [Member]
Significant Acquisitions and Disposals [Abstract]
Bridge Facility						$ 1,000