Policyholder Account Balances (Schedule of Policyholder Account Balances) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Policyholder Account Balance [Line Items]
Policyholder account balances	$ 115,714	$ 113,972
UL and Other [Member]
Policyholder Account Balance [Line Items]
Policyholder account balances	37,106	37,258	$ 37,719
Variable Annuities [Member]
Policyholder Account Balance [Line Items]
Policyholder account balances	23,771	22,184	19,148
Fixed Annuity [Member]
Policyholder Account Balance [Line Items]
Policyholder account balances	23,993	23,338	22,522
Retirement Plan Services Segment [Member]
Policyholder Account Balance [Line Items]
Policyholder account balances	24,994	25,138	$ 23,579
Other [Member]
Policyholder Account Balance [Line Items]
Policyholder account balances	5,850	6,054
Reinsurance Agreement [Member]
Policyholder Account Balance [Line Items]
Policyholder account balances	$ 5,400	$ 5,700