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Acquisitions and Related Transactions (2017 Acquisitions) (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2017 USD ($) | Oct. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 382 |  |  |
Income (loss) from discontinued operations, net of income taxes |  |  | $ (479) | $ 81 | $ 130
Subsequent Event [Member] | 7-Eleven Transaction [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of Stores | 1,112 |  |  |  |
Payments to Acquire Businesses, Gross | $ 3,300 |  |  |  |
Subsequent Event [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of Stores | 208 |  |  |  |
Sold in another transaction [Member] | Subsequent Event [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of Stores | 9 |  |  |  |
Stores held for sale [Member] | Subsequent Event [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of Stores | 97 |  |  |  |
Stores held for sale and currently sold [Member] | Subsequent Event [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of Stores | 16 |  |  |  |
Stores held for sale and currently under contract [Member] | Subsequent Event [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of Stores | 20 |  |  |  |
7-Eleven Transaction [Member] | Subsequent Event [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of Stores | 31 |  |  |  |
Currently being marketed [Member] | Subsequent Event [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of Stores | 21 |  |  |  |
Sunoco LP Convenience Store Sale [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents |  |  | 20 | 25 |
Disposal Group, Including Discontinued Operation, Revenue |  |  | 7,402 | 7,922 | 3,052
Disposal Group, Including Discontinued Operation, Assets |  |  | 4,549 | 4,647 |
Disposal Group, Including Discontinued Operation, Other Assets |  |  | 2 | 19 |
Disposal Group, Including Discontinued Operation, Intangible Assets |  |  | 503 | 535 |
Disposal Group, Including Discontinued Operation, Goodwill |  |  | 1,568 | 1,988 |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  |  | 2,185 | 1,899 |
Disposal Group, Including Discontinued Operation, Other Assets, Current |  |  | 83 | 10 |
Disposal Group, Including Discontinued Operation, Inventory |  |  | 188 | 171 |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  |  | 68 | 67 |
Disposal Group, Including Discontinued Operation, Costs of Goods Sold |  |  | 6,020 | 6,574 | 2,553
Disposal Group, Including Discontinued Operation, Operating Expense |  |  | 1,486 | 933 | 291
Disposal Group, Including Discontinued Operation, Depreciation and Amortization |  |  | 193 | 175 | 55
Disposal Group, Including Discontinued Operation, General and Administrative Expense |  |  | 114 | 91 | 55
Disposal Group, Including Discontinued Operations, Total Costs and Expenses |  |  | 7,813 | 7,773 | 2,954
Disposal Group, Including Discontinued Operation, Operating Income (Loss) |  |  | (411) | 149 | 98
Disposal Group, Including Discontinued Operation, Interest Expense |  |  | 29 | 22 | 1
Disposal Group, Including Discontinued Operation, Other Expense |  |  | 8 | (2) | (1)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  | (448) | 129 | 98
Discontinued Operation, Tax Effect of Discontinued Operation |  |  | 31 | 48 | 32
Income (loss) from discontinued operations, net of income taxes |  |  | (479) | 81 | 66
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  | $ (12) | $ 1 | $ 3

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