Equity - Statutory Net Income (Loss) and Capital & Surplus (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
MLIC
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	$ 2,457	$ 3,407	$ 2,737
Statutory capital and surplus	9,787	11,593
American Life
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	365	767	824
Statutory capital and surplus	7,555	8,272
Metropolitan Tower Life Insurance Company (“MTL”)
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	361	411	232
Statutory capital and surplus	2,247	2,461
Other
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	65	53	$ 91
Statutory capital and surplus	$ 347	$ 358