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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

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- Definition Amount of lease payments to be received by lessor for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919396-209981 + Details
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- Definition Amount of lease payment to be received by lessor for operating lease in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919396-209981 + Details
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