Investments (Commercial Mortgage Loans By Year Of Origination) (Details) $ in Millions	Mar. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($) item
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
Loan-to-value ratio, less than 65% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year		1,769
Amount originated in prior year		2,354
Amount originated 2 years prior		1,289
Amount originated 3 years prior		2,685
Amount originated 4 years prior		2,225
Amount originated 5 or more years prior		6,184
Total		$ 16,506
Ratio of originations in current year | item		2.06
Ratio of originations in prior year | item		3.05
Ratio of originations 2 years prior | item		3.00
Ratio of originations 3 years prior | item		2.18
Ratio of originations 4 years prior | item		2.17
Ratio of originations 5 or more years prior | item		2.44
Loan-to-value ratio, 65% to 74% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year		$ 105
Amount originated in prior year		72
Amount originated 2 years prior		17
Amount originated 3 years prior		81
Amount originated 4 years prior		71
Amount originated 5 or more years prior		131
Total		$ 477
Ratio of originations in current year | item		1.50
Ratio of originations in prior year | item		1.53
Ratio of originations 2 years prior | item		1.58
Ratio of originations 3 years prior | item		1.50
Ratio of originations 4 years prior | item		1.62
Ratio of originations 5 or more years prior | item		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 3 years prior		29
Total		$ 31
Ratio of originations in current year | item		1.45
Ratio of originations 3 years prior | item		1.58
Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	$ 155
Amount originated in prior year	1,867
Amount originated 2 years prior	2,419
Amount originated 3 years prior	1,298
Amount originated 4 years prior	2,784
Amount originated 5 or more years prior	8,496
Total	17,019
Commercial [Member] | Loan-to-value ratio, less than 65% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	155
Amount originated in prior year	1,769
Amount originated 2 years prior	2,349
Amount originated 3 years prior	1,284
Amount originated 4 years prior	2,673
Amount originated 5 or more years prior	8,192
Total	$ 16,422
Ratio of originations in current year | item	1.61
Ratio of originations in prior year | item	2.06
Ratio of originations 2 years prior | item	3.05
Ratio of originations 3 years prior | item	2.86
Ratio of originations 4 years prior | item	2.23
Ratio of originations 5 or more years prior | item	2.40
Commercial [Member] | Loan-to-value ratio, 65% to 74% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in prior year	$ 97
Amount originated 2 years prior	70
Amount originated 3 years prior	14
Amount originated 4 years prior	93
Amount originated 5 or more years prior	221
Total	$ 495
Ratio of originations in prior year | item	2.02
Ratio of originations 2 years prior | item	1.51
Ratio of originations 3 years prior | item	1.54
Ratio of originations 4 years prior | item	1.50
Ratio of originations 5 or more years prior | item	1.54
Commercial [Member] | Loan-to-value ratio, 75% to 100% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in prior year	$ 1
Amount originated 4 years prior	18
Amount originated 5 or more years prior	83
Total	$ 102
Ratio of originations in prior year | item	1.13
Ratio of originations 4 years prior | item	1.43
Ratio of originations 5 or more years prior | item	1.33