This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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The proportionate share of interest (percent) in a jointly owned utility plant.

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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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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Value transferred out of real estate owned (REO) in noncash transactions.

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Acquisitions, Dispositions and Sales of Other Assets (Narrative) (Details) (USD $)	12 Months Ended			3 Months Ended	0 Months Ended	12 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2017	Jan. 12, 2012	Dec. 31, 2015	Dec. 31, 2012	Jul. 02, 2012	Jun. 30, 2015
Significant Acquisitions and Disposals [Line Items]
Payments to Acquire Businesses, Gross	$ 54,000,000		$ 451,000,000
Goodwill	16,321,000,000us-gaap_Goodwill	16,340,000,000us-gaap_Goodwill
Capital expenditures	5,384,000,000	5,526,000,000	5,501,000,000
Commercial Power [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds			187,000,000
Duke Energy Carolinas [Member]
Significant Acquisitions and Disposals [Line Items]
Capital expenditures	1,879,000,000	1,695,000,000	1,908,000,000
Progress Energy [Member]
Significant Acquisitions and Disposals [Line Items]
Goodwill	3,655,000,000	3,655,000,000
Capital expenditures	1,940,000,000	2,490,000,000	2,366,000,000
Duke Energy Progress [Member]
Significant Acquisitions and Disposals [Line Items]
Capital expenditures	1,241,000,000	1,567,000,000	1,525,000,000
Duke Energy Florida [Member]
Significant Acquisitions and Disposals [Line Items]
Capital expenditures	699,000,000	915,000,000	809,000,000
Duke Energy Florida [Member] \| Scenario, Forecast [Member]
Significant Acquisitions and Disposals [Line Items]
Payments to Acquire Businesses, Gross				166,000,000
Duke Energy Ohio [Member]
Significant Acquisitions and Disposals [Line Items]
Goodwill	920,000,000	920,000,000
Capital expenditures	322,000,000	434,000,000	514,000,000
Transfer of Vermillion Generating Station			28,000,000		28,000,000
Duke Energy Indiana [Member]
Significant Acquisitions and Disposals [Line Items]
Capital expenditures	625,000,000	545,000,000	718,000,000
Transfer of Vermillion Generating Station			26,000,000		26,000,000
NCEMPA Generating Assets [Member] \| Duke Energy Progress [Member] \| Scenario, Forecast [Member]
Significant Acquisitions and Disposals [Line Items]
Payments to Acquire Businesses, Gross						1,200,000,000
Progress Merger [Member]
Significant Acquisitions and Disposals [Line Items]
Business combination, pro forma information, revenue of acquiree since acquisition date, actual			4,943,000,000
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual			368,000,000
Property, plant and equipment								23,141,000,000
Goodwill								12,469,000,000
Working capital								3,204,000,000
Ibener [Member]
Significant Acquisitions and Disposals [Line Items]
Payments to Acquire Businesses, Gross							415,000,000
Property, plant and equipment			383,000,000				383,000,000
Intangibles			30,000,000				30,000,000
Deferred tax			57,000,000				57,000,000
Goodwill			54,000,000				54,000,000
Working capital			8,000,000				8,000,000
Duke Energy Vermillion [Member] \| Duke Energy Ohio [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds					82,000,000
Duke Energy Vermillion [Member] \| Duke Energy Indiana [Member]
Significant Acquisitions and Disposals [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share					62.50%
Capital expenditures					68,000,000
Midwest Generation Business [Member] \| Duke Energy Ohio [Member] \| Scenario, Forecast [Member]
Significant Acquisitions and Disposals [Line Items]
Disposal Group, Including Discontinued Operation, Consideration									$ 2,800,000,000