Investments In And Advances To Affiliates (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) facility entity	Dec. 31, 2017 entity
Schedule Of Equity Method Investments [Line Items]
Amount of credit facility provided to unconsolidated affiliates	$ 105
Number of unconsolidated affiliates provided with credit facilities by the entity | entity	4
Number of credit facilities with outstanding balance | facility	2
Number of credit facilities with no outstanding balance | facility	2
Outstanding balance of credit facilities	$ 34
Wilmar International Limited [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	24.90%	24.90%
Carrying value of direct investments	$ 3,900
Market value of direct investments	$ 3,600
Minimum [Member]
Schedule Of Equity Method Investments [Line Items]
Credit facility, basis spread on floating interest rate	0.00%
Maximum [Member]
Schedule Of Equity Method Investments [Line Items]
Credit facility, basis spread on floating interest rate	5.74%
Equity Method Investments [Member]
Schedule Of Equity Method Investments [Line Items]
Number of unconsolidated affiliates | entity	56	56
Undistributed earnings of unconsolidated affiliates	$ 2,400