Investments (Schedule Of Default Assumptions By Moody's Rating Categories) (Details)	12 Months Ended
	Dec. 31, 2019
Below Investment_Grade [Member] | Ba
Financing Receivable, Credit Quality Indicator [Line Items]
1-in-100 Year Default Rate	4.80%
Historical Mean Default Rate	1.00%
Below Investment_Grade [Member] | B
Financing Receivable, Credit Quality Indicator [Line Items]
1-in-100 Year Default Rate	12.00%
Historical Mean Default Rate	3.10%
Below Investment_Grade [Member] | Moody's Caa-C Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
1-in-100 Year Default Rate	36.30%
Historical Mean Default Rate	10.40%
External Credit Rating, Investment Grade [Member] | Aaa - Baa | Minimum
Financing Receivable, Credit Quality Indicator [Line Items]
1-in-100 Year Default Rate	0.00%
Historical Mean Default Rate	0.00%
External Credit Rating, Investment Grade [Member] | Aaa - Baa | Maximum
Financing Receivable, Credit Quality Indicator [Line Items]
1-in-100 Year Default Rate	1.30%
Historical Mean Default Rate	0.30%