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Debt (Tables) | 3 Months Ended
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Mar. 31, 2016
Debt Disclosure [Abstract] |
Summary of credit facilities | We had outstanding borrowings, letters of credit issued, and availability under our credit facilities as follows (in millions):
|  |  |  |  |  | March 31, 2016
|  | Facility Amount |  | Maturity Date |  | Outstanding Borrowings |  | Letters of Credit |  | Availability
Committed facilities: |  |  |  |  |  |  |  |  |  |
Revolver |  | $ | 3,000 |  |  | November 2020 |  | $ | — |  |  | $ | 53 |  |  | $ | 2,947 |
VLP Revolver |  | $ | 750 |  |  | November 2020 |  | $ | 175 |  |  | $ | — |  |  | $ | 575 |
Canadian Revolver |  | C$ | 50 |  |  | November 2016 |  | C$ | — |  |  | C$ | 10 |  |  | C$ | 40 |
Accounts receivable sales facility |  | $ | 1,400 |  |  | July 2016 |  | $ | 100 |  |  | $ | — |  |  | $ | 974 |
Letter of credit facilities |  | $ | 275 |  |  | June 2016 and November 2016 |  | $ | — |  |  | $ | 16 |  |  | $ | 259 |
Uncommitted facilities: |  |  |  |  |  |  |  |  |  |
Letter of credit facilities |  | $ | 700 |  |  | N/A |  | $ | — |  |  | $ | 61 |  |  | $ | 639 |

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to 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. + 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 FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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