Investments (Residential Mortgage Loans By Year Of Origination) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year		$ 1,876
Amount originated in prior year		2,426
Amount originated 2 years prior		1,306
Amount originated 3 years prior		2,795
Amount originated 4 years prior		2,296
Amount originated 5 or more years prior		6,315
Total		17,014
Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	$ 13	583
Amount originated in prior year	620	533
Amount originated 2 years prior	519	93
Amount originated 3 years prior	91	137
Amount originated 4 years prior	130	67
Amount originated 5 or more years prior	63
Total	1,436	1,413
Performing [Member] | Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	13	578
Amount originated in prior year	613	527
Amount originated 2 years prior	513	90
Amount originated 3 years prior	89	119
Amount originated 4 years prior	116	65
Amount originated 5 or more years prior	60
Total	1,404	1,379
Nonperforming [Member] | Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year		5
Amount originated in prior year	7	6
Amount originated 2 years prior	6	3
Amount originated 3 years prior	2	18
Amount originated 4 years prior	14	2
Amount originated 5 or more years prior	3
Total	$ 32	$ 34