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Debt, Credit Facilities (Details) |  |  | 6 Months Ended |  | 6 Months Ended |  |  |  | 6 Months Ended |  |  |  | 6 Months Ended |  |  |
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Jun. 30, 2014 Other Letter of Credit [Member] USD ($) | Dec. 31, 2013 Other Letter of Credit [Member] USD ($) | Jun. 30, 2014 Credit Facilities [Member] Letter of Credit [Member] USD ($) | Dec. 31, 2013 Credit Facilities [Member] Letter of Credit [Member] USD ($) | Jun. 30, 2014 Credit Facilities [Member] U S Revolver [Member] USD ($) | Jun. 30, 2013 Credit Facilities [Member] U S Revolver [Member] USD ($) | Dec. 31, 2013 Credit Facilities [Member] U S Revolver [Member] USD ($) | Jun. 30, 2014 Credit Facilities [Member] U S Revolver [Member] Maximum [Member] | Jun. 30, 2014 Credit Facilities [Member] U S Revolver Letter of Credit [Member] USD ($) | Dec. 31, 2013 Credit Facilities [Member] U S Revolver Letter of Credit [Member] USD ($) | Jun. 30, 2014 Credit Facilities [Member] VLP Revolver [Member] USD ($) | Jun. 30, 2013 Credit Facilities [Member] VLP Revolver [Member] USD ($) | Dec. 31, 2013 Credit Facilities [Member] VLP Revolver [Member] USD ($) | Jun. 30, 2014 Credit Facilities [Member] VLP Revolver Letter of Credit [Member] USD ($) | Dec. 31, 2013 Credit Facilities [Member] VLP Revolver Letter of Credit [Member] USD ($) | Jun. 30, 2014 Credit Facilities [Member] Canadian Revolver [Member] CAD | Jun. 30, 2013 Credit Facilities [Member] Canadian Revolver [Member] CAD | Dec. 31, 2013 Credit Facilities [Member] Canadian Revolver [Member] CAD | Jun. 30, 2014 Credit Facilities [Member] Canadian Revolver Letter of Credit [Member] CAD | Dec. 31, 2013 Credit Facilities [Member] Canadian Revolver Letter of Credit [Member] CAD
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 550,000,000 |  | $ 3,000,000,000 |  |  |  |  |  | $ 300,000,000 |  |  |  |  | 50,000,000 |  |  |  |
Line of credit facility, expiration date |  |  | Jun. 30, 2015 |  | Nov. 30, 2018 |  |  |  |  |  | Dec. 31, 2018 |  |  |  |  | Nov. 30, 2014 |  |  |  |
Amount outstanding | 206,000,000 | 189,000,000 | 0 | 278,000,000 | 0 |  | 0 |  | 59,000,000 | 59,000,000 | 0 |  | 0 | 0 | 0 | 0 |  | 0 | 10,000,000 | 10,000,000
Credit Facilities (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, accordion feature, higher borrowing capacity option |  |  |  |  | 4,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt to capitalization ratios as per terms of revolver |  |  |  |  | 0.14 |  | 0.12 | 0.60 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings from long-term lines of credit |  |  |  |  | 0 | 0 |  |  |  |  | 0 | 0 |  |  |  | 0 | 0 |  |  |
Repayments of long-term lines of credit |  |  |  |  | $ 0 | $ 0 |  |  |  |  | $ 0 | $ 0 |  |  |  | 0 | 0 |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition 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. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Details
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- Definition Debt to capitalization ratios as per terms of revolver. + References No definition available. + Details
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- Definition Aggregate commitments available 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, subject to certain conditions by obtaining additional commitments from existing and/or new lenders. + References No definition available. + Details
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