Reinsurance (Reinsurance amounts included in the Statements of Financial Position) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Effects of Reinsurance [Line Items]
Reinsurance recoverables	$ 39,356,117	$ 38,598,767
Policy loans	(476,038)	(1,327,485)
Deferred policy acquisition costs	(6,197,331)	(6,830,972)
Deferred sales inducements	(314,788)	(374,649)
Other assets	1,006,312	1,140,948
Future policy benefits	25,207,277	27,927,029
Other liabilities	3,414,673	2,264,477
Impacts of Reinsurance
Effects of Reinsurance [Line Items]
Reinsurance recoverables	39,356,117	38,598,767
Policy loans	(1,007,594)	(156,749)
Deferred policy acquisition costs	(3,165,747)	(2,575,232)
Deferred sales inducements	(34,616)	(37,905)
Other assets	343,537	353,669
Policyholders’ account balances	12,020,327	12,005,839
Future policy benefits	5,078,000	5,286,252
Other liabilities	2,265,328	1,224,399
Unaffiliated activity
Effects of Reinsurance [Line Items]
Other assets	0	0
Future policy benefits	100	0
Other liabilities	$ 62,000	$ 49,000