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Summary of Significant Accounting Policies Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Accounting Policies [Abstract]      
Number of operating segments | segment 2    
Advertising costs $ 24 $ 24 $ 24
Excise and sales taxes $ 386 $ 370 $ 234
Percentage of qualifying income 90.00% 90.00% 90.00%
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 2,134 $ 2,133  
Lessee, Operating Lease, Term of Contract 40 years    
Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Intangible asset, useful life 5 years    
Lessee, Operating Lease, Term of Contract 5 years    
Lessee, Operating Lease, Renewal Term 1 year    
Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Intangible asset, useful life 20 years    
Lessee, Operating Lease, Term of Contract 15 years    
Lessee, Operating Lease, Renewal Term 20 years    
Building [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 40 years    
Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 830 810  
Equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 15 years    
Underground Storage Tanks [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 30 years    
Land Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 20 years    
Asset Retirement Obligation Costs [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 20 $ 11  
Land and Building [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Lessee, Operating Lease, Term of Contract 5 years    
Lessee, Operating Lease, Renewal Term 1 year    
Land and Building [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Lessee, Operating Lease, Term of Contract 15 years    
Lessee, Operating Lease, Renewal Term 20 years    
Vehicles [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Lessee, Operating Lease, Term of Contract 5 years