Investments (Commercial Mortgage Loans By Year Of Origination) (Details) - Commercial [Member] $ in Millions	Jun. 30, 2023 USD ($) item	Dec. 31, 2022 USD ($) item
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	$ 459	$ 1,876
Amount originated in prior year	1,862	2,426
Amount originated 2 years prior	2,411	1,306
Amount originated 3 years prior	1,264	2,795
Amount originated 4 years prior	2,698	2,296
Amount originated 5 or more years prior	8,320	6,315
Total	17,014	17,014
Loan-to-value ratio, less than 65% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	427	1,769
Amount originated in prior year	1,770	2,354
Amount originated 2 years prior	2,344	1,289
Amount originated 3 years prior	1,252	2,685
Amount originated 4 years prior	2,593	2,225
Amount originated 5 or more years prior	7,910	6,184
Total	$ 16,296	$ 16,506
Ratio of originations in current year | item	1.80	2.06
Ratio of originations in prior year | item	2.07	3.05
Ratio of originations 2 years prior | item	3.06	3.00
Ratio of originations 3 years prior | item	2.90	2.18
Ratio of originations 4 years prior | item	2.23	2.17
Ratio of originations 5 or more years prior | item	2.39	2.44
Loan-to-value ratio, 65% to 74% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	$ 32	$ 105
Amount originated in prior year	91	72
Amount originated 2 years prior	67	17
Amount originated 3 years prior	12	81
Amount originated 4 years prior	87	71
Amount originated 5 or more years prior	248	131
Total	$ 537	$ 477
Ratio of originations in current year | item	1.45	1.50
Ratio of originations in prior year | item	2.05	1.53
Ratio of originations 2 years prior | item	1.51	1.58
Ratio of originations 3 years prior | item	1.55	1.50
Ratio of originations 4 years prior | item	1.50	1.62
Ratio of originations 5 or more years prior | item	1.67	1.75
Loan-to-value ratio, 75% to 100% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year		$ 2
Amount originated in prior year	$ 1
Amount originated 3 years prior		29
Amount originated 4 years prior	18
Amount originated 5 or more years prior	162
Total	$ 181	$ 31
Ratio of originations in current year | item		1.45
Ratio of originations in prior year | item	1.13
Ratio of originations 3 years prior | item		1.58
Ratio of originations 4 years prior | item	1.43
Ratio of originations 5 or more years prior | item	1.57