Separate Accounts - Summary of Balances and Changes in Separate Account Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 171,483	$ 158,257
Reinsurance Agreement | Protective
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	50	46
Variable Annuities
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	120,470	113,356	$ 105,192	$ 105,573
UL and Other
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	28,921	25,150	22,642	20,920
Retirement Plan Services
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	22,033	19,699	$ 17,928	$ 16,996
Other
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 59	$ 52