Separate Accounts - Summary of Balances and Changes in Separate Account Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 162,506	$ 168,438
Reinsurance Agreement | Protective
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	47	49
Variable Annuities
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	113,635	117,998	$ 118,176	$ 113,356
UL and Other
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	28,106	28,841	27,007	25,150
Retirement Plan Services
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	20,708	21,541	$ 20,986	$ 19,699
Other
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 57	$ 58