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Long-Term Debt (Revolving Credit Agreement) (Details) $ in Millions | Sep. 25, 2014 USD ($) | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 | Apr. 10, 2015 USD ($) | Apr. 04, 2013 dealer
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving line of credit |  |  |  |  |  | $ 0 | $ 765 |  |  |
Number Of Dealer Operated Sites | dealer |  |  |  |  |  |  |  |  |  | 50
2014 Revolver [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving line of credit |  |  |  |  |  | $ 0 | $ 765 |  |  |
Revolving Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio |  |  |  |  |  | 5.50 |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,250 |  |  |  |  |  |  |  | $ 1,500 |
Line of Credit Facility, Additional Borrowing Capacity |  |  |  |  |  |  |  |  | $ 250 |
Debt Instrument, Additional Collateral For Debt | 66.00% |  |  |  |  |  |  |  |  |
Revolving line of credit |  |  |  |  |  | $ 0 |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  | 8 |  |  |  |
Current borrowing capacity |  |  |  |  |  | $ 1,500 |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] | Incremental Addition to One Month LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] | Incremental Addition to Federal Funds Rate [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.25% |  |  |  |  |  |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] | Minimum [Member] | Applicable Margin on LIBOR Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |  |  |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] | Minimum [Member] | Applicable Margin on Base Rate Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.50% |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio |  |  |  |  |  | 6.00 |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] | Maximum [Member] | Applicable Margin on LIBOR Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.00% |  |  |  |  |  |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] | Maximum [Member] | Applicable Margin on Base Rate Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% |  |  |  |  |  |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] | External Credit Rating, Investment Grade [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.125% |  |  |  |  |  |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] | External Credit Rating, Investment Grade [Member] | Minimum [Member] | Applicable Margin on LIBOR Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.125% |  |  |  |  |  |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] | External Credit Rating, Investment Grade [Member] | Minimum [Member] | Applicable Margin on Base Rate Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.125% |  |  |  |  |  |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] | External Credit Rating, Investment Grade [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.275% |  |  |  |  |  |  |  |  |
Revolving Credit Agreement [Member] | 2014 Revolver [Member] | External Credit Rating, Investment Grade [Member] | Maximum [Member] | Applicable Margin on LIBOR Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% |  |  |  |  |  |  |  |  |
Revolving Credit Agreement [Member] | No disposition [Domain] | 2014 Revolver [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio |  |  |  |  |  | 6.50 | 6.75 | 6.75 |  |
Revolving Credit Agreement [Member] | Disposition of 7-Eleven Assets or West Texas Assets [Domain] | 2014 Revolver [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio |  |  |  |  |  | 5.75 | 6.00 | 6.75 |  |
Revolving Credit Agreement [Member] | Disposition of 7-Eleven Assets and West Texas Assets [Domain] [Domain] | 2014 Revolver [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio |  |  |  |  |  | 5.75 | 5.75 | 6.75 |  |
Subsequent Event [Member] | Revolving Credit Agreement [Member] | No disposition [Domain] | 2014 Revolver [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio |  | 5.50 | 5.75 | 6.00 | 6.25 |  |  |  |  |
Subsequent Event [Member] | Revolving Credit Agreement [Member] | Disposition of 7-Eleven Assets or West Texas Assets [Domain] | 2014 Revolver [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio |  | 5.50 | 5.50 | 5.50 | 5.50 |  |  |  |  |
Subsequent Event [Member] | Revolving Credit Agreement [Member] | Disposition of 7-Eleven Assets and West Texas Assets [Domain] [Domain] | 2014 Revolver [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio |  | 5.50 | 5.50 | 5.50 | 5.50 |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the noncurrent portion 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -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 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 + Details
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