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Debt, Accounts Receivable Sales Facility and Capitalized Interest (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Credit Facilities [Member] VLP Revolver [Member] | Jun. 30, 2013 Credit Facilities [Member] VLP Revolver [Member] | Jun. 30, 2014 Credit Facilities [Member] A/R Sales Facility [Member] | Jun. 30, 2013 Credit Facilities [Member] A/R Sales Facility [Member] | Dec. 31, 2013 Credit Facilities [Member] A/R Sales Facility [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Long-term Lines of Credit |  |  |  |  | $ 0 | $ 0 |  |  |
Accounts Receivable Sales Facility (Textual) |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | 300,000,000 |  | 1,500,000,000 |  |
Maturity date of accounts receivable sales facility |  |  |  |  | Dec. 31, 2018 |  | Jul. 31, 2015 |  |
Proceeds from accounts receivable sales facility |  |  |  |  |  |  | 0 | 0 |
Repayments under accounts receivable sales facility |  |  |  |  |  |  | 0 | 0 |
Amount outstanding |  |  |  |  |  |  | 100,000,000 |  | 100,000,000
Capitalized Interest (Textual) |  |  |  |  |  |  |  |  |
Interest costs incurred, capitalized | 18,000,000 | 45,000,000 | 35,000,000 | 85,000,000 |  |  |  |  |
Repayments of Long-term Lines of Credit |  |  |  |  | $ 0 | $ 0 |  |  |

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