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Reinsurance (Schedule Of Assets In Support Of Reserves) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	$ 123,044	$ 105,200
Trading securities	4,501	4,673
Equity securities	129	103
Mortgage loans on real estate	16,763	16,339
Derivative investments	3,109	1,911
Other investments	3,984	2,994
Cash and invested cash	1,708	2,563	$ 2,345	$ 1,628
Accrued investment income	1,257	1,148
Other assets	15,960	16,170
Athene Holding Ltd. [Member]
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	1,531	2,308
Trading securities	3,357	3,534
Equity securities	17	14
Mortgage loans on real estate	832	698
Derivative investments	103	130
Other investments	167	94
Cash and invested cash	92	62
Accrued investment income	42	57
Other assets	3
Total	6,144	6,897
Commercial [Member]
Ceded Credit Risk [Line Items]
Mortgage loans on real estate	$ 16,043	$ 15,606

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