Investments (Commercial Mortgage Loans By Year Of Origination) (Details) $ in Millions	Jun. 30, 2022 USD ($) item	Dec. 31, 2021 USD ($) item
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year		$ 2,520
Amount originated in prior year		1,502
Amount originated 2 years prior		3,105
Amount originated 3 years prior		2,461
Amount originated 4 years prior		1,831
Amount originated 5 or more years prior		5,752
Total		17,171
Loan-to-value ratio, less than 65% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year		2,384
Amount originated in prior year		1,358
Amount originated 2 years prior		2,917
Amount originated 3 years prior		2,274
Amount originated 4 years prior		1,655
Amount originated 5 or more years prior		5,554
Total		$ 16,142
Ratio of originations in current year | item		3.04
Ratio of originations in prior year | item		3.03
Ratio of originations 2 years prior | item		2.15
Ratio of originations 3 years prior | item		2.13
Ratio of originations 4 years prior | item		2.33
Ratio of originations 5 or more years prior | item		2.41
Loan-to-value ratio, 65% to 74% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year		$ 136
Amount originated in prior year		144
Amount originated 2 years prior		188
Amount originated 3 years prior		172
Amount originated 4 years prior		149
Amount originated 5 or more years prior		171
Total		$ 960
Ratio of originations in current year | item		1.74
Ratio of originations in prior year | item		2.06
Ratio of originations 2 years prior | item		1.42
Ratio of originations 3 years prior | item		1.59
Ratio of originations 4 years prior | item		1.74
Ratio of originations 5 or more years prior | item		1.76
Loan-to-value ratio, 75% to 100% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated 3 years prior		$ 15
Amount originated 4 years prior		27
Amount originated 5 or more years prior		27
Total		$ 69
Ratio of originations 3 years prior | item		1.02
Ratio of originations 4 years prior | item		0.83
Ratio of originations 5 or more years prior | item		1.08
Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	$ 1,014
Amount originated in prior year	2,440
Amount originated 2 years prior	1,347
Amount originated 3 years prior	2,861
Amount originated 4 years prior	2,355
Amount originated 5 or more years prior	6,869
Total	16,886
Commercial [Member] | Loan-to-value ratio, less than 65% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	963
Amount originated in prior year	2,363
Amount originated 2 years prior	1,328
Amount originated 3 years prior	2,702
Amount originated 4 years prior	2,189
Amount originated 5 or more years prior	6,575
Total	$ 16,120
Ratio of originations in current year | item	2.20
Ratio of originations in prior year | item	3.05
Ratio of originations 2 years prior | item	2.99
Ratio of originations 3 years prior | item	2.14
Ratio of originations 4 years prior | item	2.13
Ratio of originations 5 or more years prior | item	2.38
Commercial [Member] | Loan-to-value ratio, 65% to 74% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated in current year	$ 51
Amount originated in prior year	77
Amount originated 2 years prior	19
Amount originated 3 years prior	159
Amount originated 4 years prior	151
Amount originated 5 or more years prior	267
Total	$ 724
Ratio of originations in current year | item	1.55
Ratio of originations in prior year | item	1.52
Ratio of originations 2 years prior | item	1.54
Ratio of originations 3 years prior | item	1.48
Ratio of originations 4 years prior | item	1.56
Ratio of originations 5 or more years prior | item	1.48
Commercial [Member] | Loan-to-value ratio, 75% to 100% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Amount originated 4 years prior	$ 15
Amount originated 5 or more years prior	27
Total	$ 42
Ratio of originations 4 years prior | item	0.54
Ratio of originations 5 or more years prior | item	0.81