Investments (Residential Mortgage Loans By Year Of Origination) (Details) - Residential [Member] - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	$ 13	$ 583
Originated in prior year	620	533
Originated in two years prior	519	93
Originated in three years prior	91	137
Originated in four years prior	130	67
Originated in five years prior and prior	63
Total	1,436	1,413
Performing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	13	578
Originated in prior year	613	527
Originated in two years prior	513	90
Originated in three years prior	89	119
Originated in four years prior	116	65
Originated in five years prior and prior	60
Total	1,404	1,379
Nonperforming [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year		5
Originated in prior year	7	6
Originated in two years prior	6	3
Originated in three years prior	2	18
Originated in four years prior	14	2
Originated in five years prior and prior	3
Total	$ 32	$ 34