Investments (Residential Mortgage Loans By Year Of Origination) (Details) - Residential [Member] - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	$ 469	$ 184
Originated in prior year	131	366
Originated in two years prior	210	187
Originated in three years prior	109
Total	919	737
Performing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	467	176
Originated in prior year	129	315
Originated in two years prior	189	175
Originated in three years prior	104
Total	889	666
Nonperforming [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	2	8
Originated in prior year	2	51
Originated in two years prior	21	12
Originated in three years prior	5
Total	$ 30	$ 71