This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Article 5

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- Definition

This item represents the amount of net sales proceeds received on disposal of an equity method investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 35

-Paragraph 35

-URI http://asc.fasb.org/extlink&oid=7658923&loc=d3e32847-111569

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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- Definition

Amount of gain (loss) on sale or disposal of an equity method investment.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Investments in Unconsolidated Affiliates (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investments In Unconsolidated Affiliates [Line Items]
Distributions from equity investments	$ 144	$ 183	$ 149
INDU Solar Holdings [Member]
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	50.00%
DukeNet [Member]
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest		50.00%
Net sales proceeds	215
Gain on sale of equity investment	$ 105
DS Cornerstone [Member]
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	50.00%
Sweetwater I-V [Member]
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	50.00%
National Methanol Company [Member]
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	25.00%
Duke American Transmission Co. [Member]
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	50.00%