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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |  |
Number of operating segments | segment | 2 |  |  |
Advertising costs | $ 24 | $ 22 | $ 22 |
Assets Held-for-sale, Not Part of Disposal Group, Current | 3,313 | 177 |  |
Excise and sales taxes | $ 234 | $ 243 | $ 231 |
Percentage of qualifying income | 90.00% | 90.00% |  | 90.00%
assets held for sale, current and noncurrent |  | $ 3,600 |  |
Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Intangible asset, useful life | 5 years |  |  |
Lease term | 5 years |  |  |
Minimum [Member] | Supply Agreements [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Intangible assets, weighted average useful life | 5 years |  |  |
Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Intangible asset, useful life | 20 years |  |  |
Lease term | 15 years |  |  |
Maximum [Member] | Supply Agreements [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Intangible assets, weighted average useful life | 15 years |  |  |
Building [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
PP&E, useful life | 40 years |  |  |
Equipment [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
PP&E, useful life | 3 years |  |  |
Equipment [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
PP&E, useful life | 15 years |  |  |
Underground Storage Tanks [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
PP&E, useful life | 30 years |  |  |
Land Improvements [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
PP&E, useful life | 20 years |  |  |
Vehicles [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Lease term | 5 years |  |  |

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