Separate Accounts - Summary of Balances and Changes in Separate Account Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 172,942	$ 168,438
Protective | Reinsurance Agreement
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	50	49
Variable Annuities
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	120,045	117,998	$ 116,770	$ 113,356
UL and Other
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	30,616	28,841	27,381	25,150
Retirement Plan Services
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	22,220	21,541	$ 20,993	$ 19,699
Other Operations
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 61	$ 58