| **Equity Method Investments**                                        | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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| **Equity Method Investments and Joint Ventures [Abstract]**          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   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| Equity Method Investments and Joint Ventures Disclosure [Text Block] | Equity Method InvestmentsThe consolidated financial statements include the accounts of wholly-owned subsidiaries whose investments in joint venture, energy-related businesses are accounted for under the equity method. Our ownership interest in each entity is included in “Equity method investments in non-utility activities” in “Noncurrent Assets” in the Consolidated Balance Sheets. Earnings or losses from equity method investments are included in “Income from equity method investments” in “Other Income (Expense)” in the Consolidated Statements of Comprehensive Income.As of October 31, 2014, there were no amounts that represented undistributed earnings of our 50% or less owned equity method investments in our retained earnings.Cardinal Pipeline Company, L.L.C.We own 21.49% of the membership interests in Cardinal Pipeline Company, L.L.C. (Cardinal), a North Carolina limited liability company. The other members are subsidiaries of The Williams Companies, Inc., and SCANA Corporation. Cardinal owns and operates an intrastate natural gas pipeline in North Carolina and is regulated by the NCUC. Cardinal has firm, long-term service agreements with local distribution companies for 100% of the firm transportation capacity on the pipeline, of which Piedmont subscribes to approximately 53%. Cardinal is dependent on the Williams – Transco pipeline system to deliver gas into its system for service to its customers.Cardinal enters into interest-rate swap agreements to modify the interest expense characteristics of its unsecured long-term debt. Our share of movements in the market value of these agreements are recorded as a hedge in “Accumulated other comprehensive loss” in “Stockholders’ equity” in the Consolidated Balance Sheets; the detail of our share of the market value of the swap agreements is combined with our other equity method investments and presented in “Other Comprehensive Income (Loss), net of tax” in the Consolidated Statements of Comprehensive Income. Cardinal’s long-term debt is nonrecourse to the members.We have related party transactions as a transportation customer of Cardinal, and we record the transportation costs charged by Cardinal in “Cost of Gas” in the Consolidated Statements of Comprehensive Income. For each of the years ended October 31, 2014, 2013 and 2012, these transportation costs and the amounts we owed Cardinal as of October 31, 2014 and 2013 are as follows.In thousands2014 2013 2012Transportation costs$8,825 $8,775 $6,613Trade accounts payable747 755  Summarized financial information provided to us by Cardinal for 100% of Cardinal as of September 30, 2014 and 2013, and for the twelve months ended September 30, 2014, 2013 and 2012 is presented below.In thousands2014 2013 2012Current assets$8,856 $15,179  Noncurrent assets111,881 116,414  Current liabilities1,468 2,637  Noncurrent liabilities45,402 45,273  Revenues16,705 17,649 $16,165Gross profit16,705 17,649 16,165Income before income taxes8,042 9,361 10,433Pine Needle LNG Company, L.L.C.We own 45% of the membership interests in Pine Needle LNG Company, L.L.C. (Pine Needle), a North Carolina limited liability company that owns an interstate LNG storage facility in North Carolina regulated by the FERC. Pine Needle has firm, long-term service agreements for 100% of the storage capacity of the facility, of which Piedmont subscribes to approximately 64%. Effective July 1, 2013, we acquired Hess Corporation’s 5% membership interest in Pine Needle for $2.9 million,which increased our membership interest from 40% to 45%. The other members are the Municipal Gas Authority of Georgia and subsidiaries of The Williams Companies, Inc. and SCANA Corporation.Pine Needle enters into interest-rate swap agreements to modify the interest expense characteristics of its long-term debt. Our share of movements in the market value of these agreements are recorded as a hedge in “Accumulated other comprehensive loss” in “Stockholders’ equity” in the Consolidated Balance Sheets; the detail of our share of the market value of the swap agreements is combined with our other equity method investments and presented in “Other Comprehensive Income (Loss), net of tax” in the Consolidated Statements of Comprehensive Income. Pine Needle’s long-term debt is nonrecourse to the members.We have related party transactions as a customer of Pine Needle, and we record the storage costs charged by Pine Needle in “Cost of Gas” in the Consolidated Statements of Comprehensive Income. For the years ended October 31, 2014, 2013 and 2012, these gas storage costs and the amounts we owed Pine Needle as of October 31, 2014 and 2013 are as follows.In thousands2014 2013 2012Gas storage costs$11,364 $11,098 $10,410Trade accounts payable989 940  Summarized financial information provided to us by Pine Needle for 100% of Pine Needle as of September 30, 2014 and 2013, and for the twelve months ended September 30, 2014, 2013 and 2012 is presented below.In thousands2014 2013 2012Current assets$8,812 $9,225  Noncurrent assets70,837 74,710  Current liabilities38,029 3,531  Noncurrent liabilities— 35,391  Revenues18,025 16,810 $16,390Gross profit18,025 16,810 16,390Income before income taxes6,011 5,804 5,832SouthStar Energy Services LLCWe own 15% of the membership interests in SouthStar, a Delaware limited liability company. The other member is Georgia Natural Gas Company (GNGC), a wholly-owned subsidiary of AGL Resources, Inc. (AGL). SouthStar primarily sells natural gas in the unregulated retail gas market to residential, commercial and industrial customers in the eastern United States, primarily in Georgia and Illinois. We account for our investment in SouthStar using the equity method, as we have board representation with equal voting rights on significant governance matters and policy decisions, and thus, exercise significant influence over the operations of SouthStar.In September 2013, GNGC contributed its retail natural gas marketing assets and customer accounts located in Illinois. AGL acquired these retail assets and customers from Nicor Inc. in December 2011 and additional retail natural gas assets and customer accounts in a separate transaction in June 2013. We made an additional $22.5 million capital contribution to SouthStar, maintaining our 15% equity ownership, related to this transaction.SouthStar’s business is seasonal in nature as variations in weather conditions generally result in greater revenue and earnings during the winter months when weather is colder and natural gas consumption is higher. Also, because SouthStar is not a rate-regulated company, the timing of its earnings can be affected by changes in the wholesale price of natural gas. While SouthStar uses financial contracts to moderate the effect of price and weather changes on the timing of its earnings, wholesale price and weather volatility can cause variations in the timing of the recognition of earnings.These financial contracts, in the form of futures, options and swaps, are considered to be derivatives and fair value is based on selected market indices. Beginning in 2014, retirement benefits were allocated to SouthStar by its majority member with the activity of prescribed benefit expense items reflected in accumulated OCIL. Our share of movements in the market value of these derivative contracts are recorded as a hedge and the activity of the retirement benefit items are reflected in “Accumulated other comprehensive loss” in “Stockholders’ equity” in the Consolidated Balance Sheets; the detail of our share of the market value of these contracts and the retirement benefits are combined with our other equity method investments and presented in “Other Comprehensive Income (Loss), net of tax” in the Consolidated Statements of Comprehensive Income.We have related party transactions as we sell wholesale gas supplies to SouthStar, and we record the amounts billed to SouthStar in “Operating Revenues” in the Consolidated Statements of Comprehensive Income. For the years ended October 31, 2014, 2013 and 2012, our operating revenues from these sales and the amounts SouthStar owed us as of October 31, 2014 and 2013 are as follows.In thousands2014 2013 2012Operating revenues$3,541 $3,291 $2,442Trade accounts receivable460 441  Summarized financial information provided to us by SouthStar for 100% of SouthStar as of September 30, 2014 and 2013, and for the twelve months ended September 30, 2014, 2013 and 2012 is presented below.In thousands2014 2013* 2012Current assets$196,286 $199,425  Noncurrent assets143,420 147,571  Current liabilities51,435 76,346  Noncurrent liabilities83 31  Revenues845,695 639,426 $585,291Gross profit234,581 174,993 161,122Income before income taxes136,569 102,805 94,631* Amounts have been changed to reflect restatement of AGL's Form 10-K for the year ended December 31, 2013. The restatement had an immaterial impact on SouthStar's results.Hardy Storage Company, LLCWe own 50% of the membership interests in Hardy Storage Company, LLC (Hardy Storage), a West Virginia limited liability company. The other owner is a subsidiary of Columbia Gas Transmission Corporation, a subsidiary of NiSource Inc. Hardy Storage owns and operates an underground interstate natural gas storage facility located in Hardy and Hampshire Counties, West Virginia, that is regulated by the FERC. Hardy Storage has firm, long-term service agreements for 100% of the storage capacity of the facility, of which Piedmont subscribes to approximately 40%.We have related party transactions as a customer of Hardy Storage, and we record the storage costs charged by Hardy Storage in “Cost of Gas” in the Consolidated Statements of Comprehensive Income. For the years ended October 31, 2014, 2013 and 2012, these gas storage costs and the amounts we owed Hardy Storage as of October 31, 2014 and 2013 are as follows.In thousands2014 2013 2012Gas storage costs$9,461 $9,702 $9,702Trade accounts payable774 808  Summarized financial information provided to us by Hardy Storage for 100% of Hardy Storage as of October 31, 2014 and 2013, and for the twelve months ended October 31, 2014, 2013 and 2012 is presented below.In thousands2014 2013 2012Current assets$12,644 $7,641  Noncurrent assets157,861 161,282  Current liabilities17,316 12,378  Noncurrent liabilities78,830 87,184  Revenues23,804 24,375 $24,359Gross profit23,804 24,375 24,359Income before income taxes10,497 10,582 9,939Constitution Pipeline Company, LLCWe own 24% of the membership interests of Constitution Pipeline Company, LLC (Constitution), a Delaware limited liability company. The other members are subsidiaries of The Williams Companies, Inc., Cabot Oil & Gas Corporation and WGL Holdings, Inc. A subsidiary of The Williams Companies is the operator of the project. The purpose of the joint venture is to develop, construct, own and operate approximately 120 miles of interstate natural gas pipeline and related facilities connecting shale natural gas supplies and gathering systems in Susquehanna County, Pennsylvania, to the Iroquois Gas Transmission and Tennessee Gas Pipeline systems in New York. We have committed to fund an amount in proportion to our ownership interest for the development and construction of the new pipeline, which is expected to cost approximately $730 million at the project level. As of October 31, 2014, our fiscal year contributions were $37.6 million, with our total equity contributions for the project totaling $53.5 million to date. On December 2, 2014, the FERC issued a certificate of public convenience and necessity approving construction of the Constitution pipeline. The target in-service date of the project is late 2015 or 2016. The capacity of the pipeline is 100% subscribed under fifteen year service agreements with two Marcellus producer-shippers with a negotiated rate structure.Summarized financial information provided to us by Constitution for 100% of Constitution as of September 30, 2014 and 2013, and for the twelve months ended September 30, 2014 and 2013 is presented below.In thousands2014 2013 (1)Current assets$11,273 $10,944Noncurrent assets219,208 62,438Current liabilities7,667 7,960Noncurrent liabilities— —Revenues— —Gross profit— —Income before income taxes10,091 3,459     (1) Presented in the period in which we have a membership interest in Constitution, and not prior periods when we had no membership interest in Constitution. Our membership in Constitution began in November 2012.Atlantic Coast Pipeline, LLCOn September 2, 2014, Piedmont, Duke Energy, Dominion Resources, Inc. (Dominion), and AGL announced the formation of Atlantic Coast Pipeline, LLC (ACP), a Delaware limited liability company. ACP intends to construct, operate and maintain a 550 mile natural gas pipeline, with associated compression, from West Virginia through Virginia into eastern North Carolina. The pipeline is proposed to provide interstate natural gas transportation services for Marcellus and Utica gas supplies into southeastern markets. ACP, which is regulated by the FERC, will be designed with an initial capacity of 1.5 billion cubic feet per day with a target in-service date of late 2018. The capacity of ACP is substantially subscribed by the members of ACP, other utilities and related companies under twenty-year contracts.We entered into an agreement through a wholly-owned subsidiary to become a 10% equity member of ACP. The other members are subsidiaries of Duke Energy, Dominion and AGL. A Dominion subsidiary will be the operator of the pipeline. The cost for the development and construction of the pipeline is expected to be between $4.5 billion to $5 billion, excluding financing costs. Members anticipate obtaining project financing for 70% of the total costs during the construction period. As of October 31, 2014, we have made no contributions to ACP.In October 2014, ACP requested approval from the FERC to utilize the pre-filing process under which environmental review for the natural gas pipeline will commence. ACP expects to file its FERC application in the third quarter of 2015, receive the FERC certificate in the summer of 2016 and begin construction thereafter. The project is subject to FERC, state and other federal approvals. |

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| - Definition
The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.
+ 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=35687916&loc=d3e32787-111569Reference 4: 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=35687916&loc=d3e32847-111569
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