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]
Originated in current year	$ 185	$ 583
Originated in prior year	616	533
Originated in two years prior	506	93
Originated in three years prior	88	137
Originated in four years prior	124	67
Originated in five years prior and prior	60
Total	1,579	1,413
Performing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	185	578
Originated in prior year	602	527
Originated in two years prior	496	90
Originated in three years prior	87	119
Originated in four years prior	105	65
Originated in five years prior and prior	57
Total	1,532	1,379
Nonperforming [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year		5
Originated in prior year	14	6
Originated in two years prior	10	3
Originated in three years prior	1	18
Originated in four years prior	19	2
Originated in five years prior and prior	3
Total	$ 47	$ 34