Investments (Residential Mortgage Loans By Year Of Origination) (Details) - Residential [Member] - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	$ 185	$ 583
Amount originated in prior year	616	533
Amount originated 2 years prior	506	93
Amount originated 3 years prior	88	137
Amount originated 4 years prior	124	67
Amount originated 5 or more years prior	60
Total	1,579	1,413
Performing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	185	578
Amount originated in prior year	602	527
Amount originated 2 years prior	496	90
Amount originated 3 years prior	87	119
Amount originated 4 years prior	105	65
Amount originated 5 or more years prior	57
Total	1,532	1,379
Nonperforming [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year		5
Amount originated in prior year	14	6
Amount originated 2 years prior	10	3
Amount originated 3 years prior	1	18
Amount originated 4 years prior	19	2
Amount originated 5 or more years prior	3
Total	$ 47	$ 34