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Discontinued Operations Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) store | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Jan. 18, 2017 store
Goodwill, Impairment Loss |  |  |  | $ 387 |
Number of Stores | store |  | 47 |  |  | 97
Goodwill |  | $ 1,430 |  | 1,430 |
Non-cash unit based compensation expense | [1] | $ 3 | $ 4 |  |
Store under Contract [Member] |  |  |  |  |
Number of Stores | store |  | 1 |  |  |
Store sales to 7-Eleven [Domain] |  |  |  |  |
Number of Stores | store |  | 32 |  |  |
Store Sold to Other Entities [Domain] |  |  |  |  |
Number of Stores | store |  | 9 |  |  |
Store on Market [Domain] |  |  |  |  |
Number of Stores | store |  | 8 |  |  |
Retail Segment [Member] |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | $ (102) |
Goodwill |  | $ 678 |  |  |
7-Eleven sales [Member] |  |  |  |  |
Business Acquisition, Transaction Costs |  | $ 1 |  |  |
[1] | (1)Includes amounts from discontinued operations.

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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