Investments (Residential Mortgage Loans By Year Of Origination) (Details) - Residential [Member] - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	$ 469,000,000	$ 184,000,000
Amount originated in prior year	131,000,000	366,000,000
Amount originated 2 years prior	210,000,000	187,000,000
Amount originated 3 years prior	109,000,000
Total	919,000,000	737,000,000
Performing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	467,000,000	176,000,000
Amount originated in prior year	129,000,000	315,000,000
Amount originated 2 years prior	189,000,000	175,000,000
Amount originated 3 years prior	104,000,000
Total	889,000,000	666,000,000
Nonperforming [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	2,000,000	8,000,000
Amount originated in prior year	2,000,000	51,000,000
Amount originated 2 years prior	21,000,000	12,000,000
Amount originated 3 years prior	5,000,000
Total	$ 30,000,000	$ 71,000,000