Investments In And Advances To Affiliates (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) facility entity	Dec. 31, 2018 entity
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	$ 31
Wilmar International Limited [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	24.80%	24.90%
Carrying value of direct investments	$ 3,900
Market value of direct investments	$ 4,800
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	4.41%
Equity Method Investments [Member]
Schedule Of Equity Method Investments [Line Items]
Number of unconsolidated affiliates | entity	63	56
Undistributed earnings of unconsolidated affiliates	$ 2,300