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Reinsurance (Schedule Of Assets In Support Of Reserves) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	$ 117,313	$ 123,044
Trading securities	4,365	4,501
Equity securities	123	129
Mortgage loans on real estate	17,255	16,763
Derivative investments	3,453	3,109
Other investments	3,548	3,984
Cash and invested cash	1,350	1,708	$ 6,202	$ 2,563
Accrued investment income	1,301	1,257
Other assets	17,298	15,960
Athene Holding Ltd. [Member]
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	1,357	1,531
Trading securities	3,293	3,357
Equity securities	20	17
Mortgage loans on real estate	875	832
Derivative investments	106	103
Other investments	212	167
Cash and invested cash	81	92
Accrued investment income	39	42
Other assets	6	3
Total	5,989	6,144
Commercial [Member]
Ceded Credit Risk [Line Items]
Mortgage loans on real estate	$ 16,489	$ 16,043

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