Investments (Residential Mortgage Loans By Year Of Origination) (Details) - Residential [Member] - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	$ 134	$ 469
Originated in prior year	577	131
Originated in two years prior	116	210
Originated in three years prior	187	109
Originated in four years prior	91
Total	1,105	919
Performing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	134	467
Originated in prior year	574	129
Originated in two years prior	113	189
Originated in three years prior	170	104
Originated in four years prior	88
Total	1,079	889
Nonperforming [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year		2
Originated in prior year	3	2
Originated in two years prior	3	21
Originated in three years prior	17	5
Originated in four years prior	3
Total	$ 26	$ 30