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Long-Term Debt (Revolving Credit Agreement) (Details) |  |  | 3 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) | Sep. 25, 2014 USD ($) | Sep. 30, 2016 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 USD ($) | Sep. 30, 2017 | Dec. 31, 2016 USD ($) | Apr. 10, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit |  |  |  |  |  |  |  |  | $ 765,000,000 |  | $ 1,000,000,000 |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 1,250,000,000.00 |  |  |  |  |  |  |  |  |  | $ 1,500,000,000.0
Additional borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000
Additional collateral for debt |  | 66.00% |  |  |  |  |  |  |  |  |  |
Revolving line of credit |  |  |  |  |  |  |  |  | 765,000,000 |  | $ 1,000,000,000 |
Standby letters |  |  |  |  |  |  |  |  | 9,000,000 |  |  |
Unused borrowing capacity |  |  |  |  |  |  |  |  | $ 726,000,000 |  |  |
Revolving Credit Facility [Member] | Federal Funds Effective Swap Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.50% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee on unused capacity |  | 0.25% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.50% | 2.75% |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.50% | 1.75% |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee on unused capacity |  | 0.50% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.00% | 3.00% |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.00% | 2.00% |  |  |  |  |  |  |  |  |
External Credit Rating, Investment Grade [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.125% |  |  |  |  |  |  |  |  |  |
External Credit Rating, Investment Grade [Member] | Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.125% |  |  |  |  |  |  |  |  |  |
External Credit Rating, Investment Grade [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee on unused capacity |  | 0.125% |  |  |  |  |  |  |  |  |  |
External Credit Rating, Investment Grade [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.00% |  |  |  |  |  |  |  |  |  |
Commitment fee on unused capacity |  | 0.275% |  |  |  |  |  |  |  |  |  |
External Credit Rating, Investment Grade [Member] | Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio (not more than) |  |  |  |  |  |  |  |  | 5.50 |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio (not more than) |  |  |  |  |  |  |  |  | 6.00 |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio (not more than) |  |  |  |  |  |  |  |  | 6.75 |  |  |
Leverage ratio, certain acquisitions (not more than) | 6.0 |  |  |  |  |  |  |  |  |  |  |
Leverage ratio, certain acquisitions threshold (in excess of) | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Term Loan [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio (not more than) |  |  |  | 5.5 | 5.75 | 6.0 | 6.25 | 6.5 |  |  |  |
Term Loan [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.50% |  | 2.75% |  |  |  |  |  |  |  |  |
Term Loan [Member] | Minimum [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  | 1.75% |  |  |  |  |  |  |  |  |
Term Loan [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.00% |  | 3.00% |  |  |  |  |  |  |  |  |
Term Loan [Member] | Maximum [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% |  | 2.00% |  |  |  |  |  |  |  |  |
No disposition [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio (not more than) |  |  |  |  |  |  |  |  | 6.75 | 6.75 |  |
No disposition [Member] | Revolving Credit Facility [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio (not more than) |  |  |  | 5.50 | 5.75 | 6.00 | 6.25 | 6.50 |  |  |  |
Disposition of 7-Eleven assets or West Texas Assets [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio (not more than) |  |  |  |  |  |  |  |  | 6.00 | 6.75 |  |
Disposition of 7-Eleven assets or West Texas Assets [Member] | Revolving Credit Facility [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio (not more than) |  |  |  | 5.50 | 5.50 | 5.50 | 5.50 | 5.75 |  |  |  |
Disposition of 7-Eleven assets and West Texas assets [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio (not more than) |  |  |  |  |  |  |  |  | 5.75 | 6.75 |  |
Disposition of 7-Eleven assets and West Texas assets [Member] | Revolving Credit Facility [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio (not more than) |  |  |  | 5.50 | 5.50 | 5.50 | 5.50 | 5.75 |  |  |  |

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