Reinsurance (Reinsurance amounts included in the Statements of Financial Position) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Effects of Reinsurance [Line Items]
Reinsurance recoverables	$ 38,809,510	$ 38,598,767
Policy loans	(489,592)	(1,327,485)
Deferred policy acquisition costs	6,310,935	6,830,972
Deferred sales inducements	(297,772)	(374,649)
Other assets	986,295	1,140,948
Future policy benefits	24,112,142	27,927,029
Other liabilities	3,203,069	2,264,477
Impacts of Reinsurance
Effects of Reinsurance [Line Items]
Reinsurance recoverables	38,809,510	38,598,767
Policy loans	(1,012,829)	(156,749)
Deferred policy acquisition costs	3,203,610	2,575,232
Deferred sales inducements	(34,354)	(37,905)
Other assets	854,974	850,681
Policyholders' account balance	13,655,630	14,386,443
Future policy benefits	5,167,591	5,286,252
Other liabilities	2,616,417	1,642,413
Unaffiliated activity
Effects of Reinsurance [Line Items]
Deferred policy acquisition costs	481,000	0
Other assets	742,000	497,000
Policyholders' account balance	9,209,000	0
Future policy benefits	2,000	0
Other liabilities	$ 599,000	$ 467,000