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	$ 116,167	$ 114,435
UL and Other [Member]
Policyholder Account Balance [Line Items]
Policyholder account balances	37,533	37,694	$ 38,200
Variable Annuities [Member]
Policyholder Account Balance [Line Items]
Policyholder account balances	23,771	22,184	19,148
Fixed Annuities [Member]
Policyholder Account Balance [Line Items]
Policyholder account balances	24,019	23,365	22,552
Retirement Plan Services [Member]
Policyholder Account Balance [Line Items]
Policyholder account balances	24,994	25,138	$ 23,579
Other Operations [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