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Debt - Commercial Paper and Credit Facilities (Details) | 12 Months Ended |
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Dec. 31, 2018 USD ($) extension | Aug. 31, 2018 USD ($) debt_instrument
Commercial Paper |  |
Debt Instrument [Line Items] |  |
Maximum aggregate borrowing capacity | $ 3,000,000,000 |
Senior secured hedged inventory facility |  |
Debt Instrument [Line Items] |  |
Maximum aggregate borrowing capacity | 1,900,000,000 |
Committed borrowing capacity | $ 1,400,000,000 |
Number of years by which maturity date of credit facility may be extended | 1 year |
Senior secured hedged inventory facility | Minimum |  |
Debt Instrument [Line Items] |  |
Credit facility extensions available | extension | 1 |
Senior secured hedged inventory facility | Letters of credit |  |
Debt Instrument [Line Items] |  |
Committed borrowing capacity | $ 400,000,000 |
Senior unsecured revolving credit facility |  |
Debt Instrument [Line Items] |  |
Maximum aggregate borrowing capacity | 2,100,000,000 |
Committed borrowing capacity | $ 1,600,000,000 |
Number of years by which maturity date of credit facility may be extended | 1 year |
Senior unsecured revolving credit facility | Minimum |  |
Debt Instrument [Line Items] |  |
Credit facility extensions available | extension | 1 |
GO Zone Term Loans | Term Loan |  |
Debt Instrument [Line Items] |  |
Number of debt instruments | debt_instrument |  | 2
GO Zone Term Loan 1 | Term Loan |  |
Debt Instrument [Line Items] |  |
Debt instrument face value |  | $ 100,000,000
GO Zone Term Loan 2 | Term Loan |  |
Debt Instrument [Line Items] |  |
Debt instrument face value |  | $ 100,000,000
Non-extending Lender | Senior secured hedged inventory facility |  |
Debt Instrument [Line Items] |  |
Committed borrowing capacity | $ 35,000,000 |
Non-extending Lender | Senior unsecured revolving credit facility |  |
Debt Instrument [Line Items] |  |
Committed borrowing capacity | $ 35,000,000 |

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- Definition Debt, Number Of Instruments + References No definition available. + Details
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- Definition Represents the period for which the credit facility may be extended by the entity, pursuant to the terms of the credit agreement. + References No definition available. + Details
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- Definition Represents the number of one-year extensions provided for under the credit facility. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- 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://fasb.org/us-gaap/role/ref/legacyRef -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 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://fasb.org/us-gaap/role/ref/legacyRef -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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