Separate Accounts - Summary of Balances and Changes in Separate Account Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 165,199	$ 158,257
Reinsurance Agreement | Protective
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	48	46
Variable Annuities
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	116,770	113,356	$ 110,998	$ 105,573
UL and Other
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	27,381	25,150	23,409	20,920
Retirement Plan Services
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	20,993	19,699	$ 18,789	$ 16,996
Other
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 55	$ 52