Investments (Commercial Mortgage Loans By Year Of Origination) (Details) $ in Millions	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($) item
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	$ 1,876
Originated in prior year	2,407
Originated in two years prior	1,297
Originated in three years prior	2,753
Originated in four years prior	2,289
Originated in five years prior and prior	6,301
Total	16,923
Loan-to-value ratio, less than 65% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	1,769
Originated in prior year	2,335
Originated in two years prior	1,280
Originated in three years prior	2,643
Originated in four years prior	2,222
Originated in five years prior and prior	6,170
Total	$ 16,419
Originated in current year | item	2.06
Originated in prior year | item	3.05
Originated in two years prior | item	2.99
Originated in three years prior | item	2.17
Originated in four years prior | item	2.17
Originated in five years prior and prior | item	2.44
Loan-to-value ratio, 65% to 75% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	$ 105
Originated in prior year	72
Originated in two years prior	17
Originated in three years prior	81
Originated in four years prior	67
Originated in five years prior and prior	131
Total	$ 473
Originated in current year | item	1.50
Originated in prior year | item	1.53
Originated in two years prior | item	1.58
Originated in three years prior | item	1.50
Originated in four years prior | item	1.62
Originated in five years prior and prior | item	1.75
Loan-to-value ratio, 75% to 100% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	$ 2
Originated in three years prior	29
Total	$ 31
Loan-To-Value Ratio, Greater Than 100% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year | item	1.45
Originated in three years prior | item	1.58
Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year		$ 2,497
Originated in prior year		1,493
Originated in two years prior		3,062
Originated in three years prior		2,455
Originated in four years prior		1,824
Originated in five years prior and prior		5,741
Total		17,072
Commercial [Member] | Loan-to-value ratio, less than 65% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year		2,361
Originated in prior year		1,349
Originated in two years prior		2,875
Originated in three years prior		2,272
Originated in four years prior		1,648
Originated in five years prior and prior		5,543
Total		$ 16,048
Originated in current year | item		3.05
Originated in prior year | item		3.02
Originated in two years prior | item		2.14
Originated in three years prior | item		2.13
Originated in four years prior | item		2.33
Originated in five years prior and prior | item		2.41
Commercial [Member] | Loan-to-value ratio, 65% to 75% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year		$ 136
Originated in prior year		144
Originated in two years prior		187
Originated in three years prior		168
Originated in four years prior		149
Originated in five years prior and prior		171
Total		$ 955
Originated in current year | item		1.74
Originated in prior year | item		2.06
Originated in two years prior | item		1.42
Originated in three years prior | item		1.59
Originated in four years prior | item		1.74
Originated in five years prior and prior | item		1.76
Commercial [Member] | Loan-to-value ratio, 75% to 100% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in three years prior		$ 15
Originated in four years prior		27
Originated in five years prior and prior		27
Total		$ 69
Originated in three years prior | item		1.02
Originated in four years prior | item		0.83
Originated in five years prior and prior | item		1.08