Reinsurance (Schedule Of Assets In Support Of Reserves) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	$ 116,372	$ 103,773
Trading securities	4,574	4,602
Equity securities	120	103
Mortgage loans	16,458	16,244
Derivative investments	3,235	1,911
Other investments	2,986	2,565
Cash and invested cash	1,711	1,879	$ 2,238	$ 1,848
Accrued investment income	1,273	1,109
Other assets	20,196	18,106
Athene Holding Ltd. [Member]
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	1,630	2,308
Trading securities	3,488	3,534
Equity securities	17	14
Mortgage loans	794	698
Derivative investments	95	130
Other investments	116	94
Cash and invested cash	117	62
Accrued investment income	43	57
Other assets	3
Total	$ 6,303	$ 6,897