Reinsurance (Schedule Of Assets In Support Of Reserves) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	$ 122,085	$ 123,044
Trading securities	4,191	4,501
Equity securities	243	129
Mortgage loans on real estate	17,730	16,763
Derivative investments	4,828	3,109
Other investments	4,069	3,984
Cash and invested cash	2,614	1,708	$ 2,595	$ 2,563
Accrued investment income	1,297	1,257
Other assets	17,367	15,960
Modco [Member]
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	1,114	1,531
Trading securities	3,096	3,357
Equity securities	27	17
Mortgage loans on real estate	792	832
Derivative investments	86	103
Other investments	251	167
Cash and invested cash	207	92
Accrued investment income	36	42
Other assets	25	3
Total	5,634	6,144
Commercial [Member]
Ceded Credit Risk [Line Items]
Mortgage loans on real estate	$ 16,981	$ 16,043