Investments In And Advances To Affiliates (Narrative) (Details) $ in Millions	12 Months Ended
	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