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Debt (Tables) | 3 Months Ended
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Mar. 31, 2013
Debt Disclosure [Abstract] |
Outstanding letters of credit under committed lines of credit | We had outstanding letters of credit under our committed lines of credit as follows (in millions):
|  |  |  |  |  | Amounts Outstanding
|  | Borrowing Capacity |  | Expiration |  | March 31, 2013 |  | December 31, 2012
Letter of credit facilities |  | $ | 550 |  |  | June 2013 |  | $ | 550 |  |  | $ | 418 |
Revolver |  | $ | 3,000 |  |  | December 2016 |  | $ | 59 |  |  | $ | 59 |
Canadian revolving credit facility |  | C$ | 50 |  |  | November 2013 |  | C$ | 10 |  |  | C$ | 10 |
Changes in accounts receivable sales facility | Changes in the amounts outstanding under our accounts receivable sales facility were as follows (in millions):
| Three Months Ended March 31,
| 2013 |  | 2012
Balance as of beginning of period | $ | 100 |  |  | $ | 250 |
Repayments | — |  |  | (150 | )
Balance as of end of period | $ | 100 |  |  | $ | 100 |

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 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=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 4: 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 Tabular disclosure of the changes in carrying amount of the accounts receivable sales facility. + References No definition available. + Details
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