Separate Accounts - Summary of Balances and Changes in Separate Account Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 168,438	$ 158,257
Protective | Reinsurance Agreement
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	49	46
Variable Annuities
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	117,998	113,356	$ 105,573
UL and Other
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	28,841	25,150	20,920
Retirement Plan Services
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	21,541	19,699	$ 16,996
Other
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 58	$ 52