Investments (Residential Mortgage Loans By Year Of Origination) (Details) - Residential [Member] - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	$ 359	$ 583
Originated in prior year	569	533
Originated in two years prior	491	93
Originated in three years prior	84	137
Originated in four years prior	115	67
Originated in five years prior and prior	58
Total	1,676	1,413
Performing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	359	578
Originated in prior year	552	527
Originated in two years prior	477	90
Originated in three years prior	83	119
Originated in four years prior	103	65
Originated in five years prior and prior	55
Total	1,629	1,379
Nonperforming [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year		5
Originated in prior year	17	6
Originated in two years prior	14	3
Originated in three years prior	1	18
Originated in four years prior	12	2
Originated in five years prior and prior	3
Total	$ 47	$ 34