v2.4.0.8

Asset Retirement Obligations (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Asset Retirement Obligations [Line Items] |  |  |
Liabilities incurred in the current year | $ 3,433 | [1] |
Net property, plant and equipment | 69,595 |  | 69,490
Regulatory assets, noncurrent | 10,252 |  | 9,191
Regulatory liability, noncurrent | 6,220 |  | 5,949
Duke Energy Carolinas [Member] |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Liabilities incurred in the current year | 2,026 | [1] |
Net property, plant and equipment | 25,126 |  | 23,012
Regulatory assets, noncurrent | 1,986 |  | 1,527
Regulatory liability, noncurrent | 2,690 |  | 2,576
Duke Energy Progress [Member] |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Liabilities incurred in the current year | 1,406 | [1] |
Net property, plant and equipment | 14,580 |  | 13,650
Regulatory assets, noncurrent | 2,187 |  | 1,384
Regulatory liability, noncurrent | 1,796 |  | 1,673
North Carolina Ash Basins [Member] |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Number of Ash Basins | 32 |  |
Number of Plants with Ash Basins | 14 |  |
North Carolina Ash Basins [Member] | Duke Energy Carolinas [Member] |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Net property, plant and equipment | 1,559 |  |
Regulatory assets, noncurrent | 467 |  |
North Carolina Ash Basins [Member] | Duke Energy Progress [Member] |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Net property, plant and equipment | 610 |  |
Regulatory assets, noncurrent | 763 |  |
Removal Costs [Member] | North Carolina Ash Basins [Member] | Duke Energy Progress [Member] |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Regulatory liability, noncurrent | $ 33 |  |
[1] | Amounts relate to asset obligations recorded in the third quarter of 2014 as a result of the Coal Ash Act and an agreement with the SCDHEC related to the W.S Lee Steam Station.

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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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