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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]        
Goodwill, Impairment charges, including discontinued operations   $ 387    
Impairment in goodwill   102 $ 227  
Amortization of intangible assets   $ 61 61 $ 37
Customer Relations And Supply Agreements [Member]        
Goodwill [Line Items]        
Remaining amortization period   11 years    
Favorable leasehold arrangements, net [Member]        
Goodwill [Line Items]        
Remaining amortization period   14 years    
Other Intangible Assets [Member]        
Goodwill [Line Items]        
Remaining amortization period   13 years    
Deferred Loan Origination Costs        
Goodwill [Line Items]        
Remaining amortization period   2 years    
Retail Segment [Member]        
Goodwill [Line Items]        
Impairment in goodwill   $ (102) $ 227  
Contractual Rights [Member]        
Goodwill [Line Items]        
Impairment of intangible assets   13    
Liquor Licenses [Member]        
Goodwill [Line Items]        
Impairment of intangible assets   $ 4    
Discontinued Operations, Held-for-sale [Member]        
Goodwill [Line Items]        
Impairment in goodwill $ 23