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Reinsurance (Schedule Of Assets In Support Of Reserves) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	$ 122,215	$ 123,044
Trading securities	4,232	4,501
Equity securities	174	129
Mortgage loans on real estate	17,586	16,763
Derivative investments	4,548	3,109
Other investments	3,950	3,984
Cash and invested cash	2,389	1,708	$ 4,201	$ 2,563
Accrued investment income	1,254	1,257
Other assets	17,465	15,960
Athene Holding Ltd. [Member]
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	1,235	1,531
Trading securities	3,125	3,357
Equity securities	20	17
Mortgage loans on real estate	818	832
Derivative investments	103	103
Other investments	299	167
Cash and invested cash	182	92
Accrued investment income	41	42
Other assets	13	3
Total	5,836	6,144
Commercial [Member]
Ceded Credit Risk [Line Items]
Mortgage loans on real estate	$ 16,838	$ 16,043

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