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Investments In And Advances To Affiliates (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) entity facility | Dec. 31, 2019 USD ($) entity | Dec. 31, 2018 USD ($)
Schedule Of Equity Method Investments [Line Items] |  |  |
Amount of credit facility provided to unconsolidated affiliates | $ 106 |  |
Number of unconsolidated affiliates provided with credit facilities by the entity | entity | 5 |  |
Number of credit facilities with outstanding balance | facility | 2 |  |
Number of credit facilities with no outstanding balance | facility | 3 |  |
Outstanding balance of credit facilities | $ 36 |  |
Revenues from unconsolidated affiliates | 4,700 | $ 4,900 | $ 5,600
Trade accounts receivable due from unconsolidated affiliates | $ 197 | $ 156 |
Wilmar International Limited [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 22.20% | 24.80% |
Carrying value of direct investments | $ 3,600 |  |
Market value of direct investments | $ 5,000 |  |
Minimum [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Line of Credit Facility, Interest Rate During Period | 0.00% |  |
Maximum [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Line of Credit Facility, Interest Rate During Period | 2.46% |  |
Equity Method Investments [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Number of unconsolidated affiliates | entity | 60 | 63 |
Undistributed earnings of unconsolidated affiliates | $ 2,600 |  |

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