Investments (Commercial Mortgage Loans By Year Of Origination) (Details) - Commercial [Member] $ in Millions	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($) item
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	$ 2,497	$ 1,527
Originated in prior year	1,493	3,358
Originated in two years prior	3,062	2,576
Originated in three years prior	2,455	1,948
Originated in four years prior	1,824	1,907
Originated in five years prior and prior	5,741	4,836
Total	17,072	16,152
Loan-to-value ratio, less than 65% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	2,361	1,495
Originated in prior year	1,349	3,098
Originated in two years prior	2,875	2,379
Originated in three years prior	2,272	1,779
Originated in four years prior	1,648	1,711
Originated in five years prior and prior	5,543	4,695
Total	$ 16,048	$ 15,157
Originated in current year | item	3.05	2.85
Originated in prior year | item	3.02	2.24
Originated in two years prior | item	2.14	2.16
Originated in three years prior | item	2.13	2.34
Originated in four years prior | item	2.33	2.37
Originated in five years prior and prior | item	2.41	2.38
Loan-to-value ratio, 65% to 75% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current year	$ 136	$ 32
Originated in prior year	144	258
Originated in two years prior	187	182
Originated in three years prior	168	169
Originated in four years prior	149	174
Originated in five years prior and prior	171	133
Total	$ 955	$ 948
Originated in current year | item	1.74	1.52
Originated in prior year | item	2.06	1.78
Originated in two years prior | item	1.42	1.49
Originated in three years prior | item	1.59	1.73
Originated in four years prior | item	1.74	1.56
Originated in five years prior and prior | item	1.76	1.95
Loan-to-value ratio, 75% to 100% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in prior year		$ 2
Originated in two years prior		15
Originated in three years prior	$ 15
Originated in four years prior	27	22
Originated in five years prior and prior	27	8
Total	$ 69	$ 47
Originated in prior year | item		1.74
Originated in two years prior | item		0.71
Originated in three years prior | item	1.02
Originated in four years prior | item	0.83	1.58
Originated in five years prior and prior | item	1.08	1.02