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Commitments And Contingencies (Lessor Disclosures) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Lessor Disclosure [Abstract]        
Lessor, Operating Lease, Term of Contract 5 years   5 years  
Revenues $ 2,080 $ 4,475 $ 5,352 $ 8,167
Operating Lease, Lease Income 34 35 69 70
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]        
2020 (remainder) 59   59  
2021 96   96  
2022 62   62  
2023 8   8  
2024 2   2  
Thereafter 7   7  
Total undiscounted cash flow 234   234  
Fuel Distribution and Marketing [Member]        
Revenues 1,979 4,240 5,059 7,733
All Other [Member]        
Revenues 101 235 293 434
Lease Income [Member]        
Revenues 34 35 69 70
Lease Income [Member] | Fuel Distribution and Marketing [Member]        
Revenues 29 31 59 63
Lease Income [Member] | All Other [Member]        
Revenues 5 4 10 7
Lease Income [Member] | External Revenue [Member]        
Revenues 34 35 69 70
Lease Income [Member] | External Revenue [Member] | Fuel Distribution and Marketing [Member]        
Revenues 29 31 59 63
Lease Income [Member] | External Revenue [Member] | All Other [Member]        
Revenues $ 5 $ 4 $ 10 $ 7