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Discontinued Operations Income Statement Data for Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenues $ 3,749  
Depreciation, amortization and accretion 49  
Rent 15 $ 20
Loss on disposal of assets [1] 26 7
Interest expense, net [1] 36 64
Gain (Loss) on Extinguishment of Debt [1] 129 0
Income tax expense (benefit) 31 (14)
Loss from discontinued operations, net of income taxes (237) (11)
Discontinued Operations [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Merchandise 89 409
Rental income 0 1
Other 4 14
Revenues 349 1,586
Merchandise cost of sales 65 282
Other 0 0
Cost of Revenue 305 1,339
Gross Profit 44 247
General and administrative 2 32
Depreciation, amortization and accretion 0 33
Other operating 57 171
Rent 4 14
Loss on disposal of assets 23 5
Operating Expenses 86 255
Operating Income (Loss) (42) (8)
Interest expense, net 2 6
Gain (Loss) on Extinguishment of Debt 20 0
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax (64) (14)
Income tax expense (benefit) 173 (3)
Loss from discontinued operations, net of income taxes (237) (11)
Discontinued Operations [Member] | Retail Motor Fuel [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenues 256 1,162
Merchandise cost of sales $ 240 $ 1,057
[1] (1)Includes amounts from discontinued operations.