Separate Accounts (Schedule of Reconciliation of Separate Account Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 148,421	$ 143,536
UL and Other [Member]
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	22,162	20,920	$ 24,785
Variable Annuities [Member]
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	108,334	105,573	136,665
Retirement Plan Services [Member]
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	17,876	16,996	$ 21,068
Other Operations [Member]
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 49	$ 47