Separate Accounts - Summary of Balances and Changes in Separate Account Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 172,043	$ 180,092
Reinsurance Agreement | Protective
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	51	53
Variable Annuities
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	116,716	122,945	$ 113,635	$ 117,998
UL and Other
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	33,237	34,038	28,106	28,841
Retirement Plan Services
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	22,031	23,047	$ 20,708	$ 21,541
Other
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 59	$ 62