Separate Accounts - Summary of Balances and Changes in Separate Account Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 158,257	$ 143,536
Protective | Reinsurance Agreement
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	46	42
Variable Annuities
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	113,356	105,573	$ 136,665
UL and Other
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	25,150	20,920	24,785
Retirement Plan Services
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	19,699	16,996	$ 21,068
Other
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 52	$ 47