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Commitments and Contingencies - Lessor Disclosures (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Lessor Disclosure [Abstract]                      
Lessor, Operating Lease, Term of Contract 5 years               5 years    
Total revenues $ 4,098 $ 4,331 $ 4,475 $ 3,692 $ 3,877 $ 4,761 $ 4,607 $ 3,749 $ 16,596 $ 16,994 $ 11,723
Operating Lease, Lease Income                 142    
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]                      
2020 119               119    
2021 96               96    
2022 62               62    
2023 7               7    
2024 2               2    
Thereafter 7               7    
Total undiscounted cash flow $ 293               293    
Fuel Distribution and Marketing [Member]                      
Total revenues                   17,281 10,932
All Other [Member]                      
Total revenues                   1,482 2,388
Lease income [Member]                      
Total revenues                 $ 142 $ 130 $ 89