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Debt, Credit Facilities (Details) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 01, 2016 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2016 CAD | Mar. 31, 2016 USD ($) | Dec. 31, 2015 CAD | Dec. 31, 2015 USD ($)
U S Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 3,000,000,000 |  |
Line of credit facility, expiration date |  | Nov. 30, 2020 |  |  |  |  |
Amount outstanding |  |  |  |  | 0 |  | $ 0
Line of credit facility, remaining borrowing capacity |  |  |  |  | 2,947,000,000 |  |
Credit Facilities (Textual) |  |  |  |  |  |  |
Line of credit facility, accordion feature, higher borrowing capacity option |  |  |  |  | 4,500,000,000 |  |
U S Revolver Letter of Credit [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | 2,000,000,000 |  |
Amount outstanding |  |  |  |  | 53,000,000 |  |
VLP Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | 750,000,000 |  |
Line of credit facility, expiration date |  | Nov. 30, 2020 |  |  |  |  |
Amount outstanding |  |  |  |  | 175,000,000 |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  | 575,000,000 |  |
Credit Facilities (Textual) |  |  |  |  |  |  |
Line of credit facility, accordion feature, higher borrowing capacity option |  |  |  |  | 1,000,000,000 |  |
Line of credit facility, interest rate during period |  | 1.75% |  |  |  |  |
Borrowings from long-term lines of credit |  | $ 0 | $ 200,000,000 |  |  |  |
Repayments of long-term lines of credit |  | $ 0 |  |  |  |  |
VLP Revolver [Member] | Credit Facilities [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Credit Facilities (Textual) |  |  |  |  |  |  |
Borrowings from long-term lines of credit | $ 139,000,000 |  |  |  |  |  |
VLP Revolver Letter of Credit [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | 100,000,000 |  |
Amount outstanding |  |  |  |  | 0 |  |
Canadian Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | CAD |  |  |  | CAD 50,000,000 |  |  |
Line of credit facility, expiration date |  | Nov. 30, 2016 |  |  |  |  |
Amount outstanding | CAD |  |  |  | 0 |  | CAD 0 |
Line of credit facility, remaining borrowing capacity | CAD |  |  |  | 40,000,000 |  |  |
Canadian Revolver Letter of Credit [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Amount outstanding | CAD |  |  |  | CAD 10,000,000 |  |  |
A/R Sales Facility [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | 1,400,000,000 |  |
Line of credit facility, expiration date |  | Jul. 31, 2016 |  |  |  |  |
Amount outstanding |  |  |  |  | 100,000,000 |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  | 974,000,000 |  |
Credit Facilities (Textual) |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  | 1,100,000,000 |  |
Committed Letter of Credit Facility [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | 275,000,000 |  |
Amount outstanding |  |  |  |  | 16,000,000 |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  | 259,000,000 |  |
Committed Letter of Credit Facility Expires June 2016 [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Line of credit facility, expiration date |  | Jun. 30, 2016 |  |  |  |  |
Committed Letter of Credit Facility Expires November 2016 [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Line of credit facility, expiration date |  | Nov. 30, 2016 |  |  |  |  |
Uncommitted Letter of Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | 700,000,000 |  |
Amount outstanding |  |  |  |  | 61,000,000 |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  | $ 639,000,000 |  |

X
- 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 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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X
- References No definition available. + Details
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X
- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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 + 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 + Details
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- Definition The effective interest rate during the reporting 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- 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 + Details
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X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 + 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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 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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X
- 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 -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 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition Credit Facility, Textual [Abstract] + 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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