Investments (Residential Mortgage Loans By Year Of Origination) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year		$ 2,520
Amount originated in prior year		1,502
Amount originated 2 years prior		3,105
Amount originated 3 years prior		2,461
Amount originated 4 years prior		1,831
Amount originated 5 or more years prior		5,752
Total		17,171
Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	$ 423	469
Amount originated in prior year	547	131
Amount originated 2 years prior	97	210
Amount originated 3 years prior	152	109
Amount originated 4 years prior	74
Total	1,293	919
Performing [Member] | Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	423	467
Amount originated in prior year	542	129
Amount originated 2 years prior	95	189
Amount originated 3 years prior	134	104
Amount originated 4 years prior	70
Total	1,264	889
Nonperforming [Member] | Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year		2
Amount originated in prior year	5	2
Amount originated 2 years prior	2	21
Amount originated 3 years prior	18	5
Amount originated 4 years prior	4
Total	$ 29	$ 30