Market Risk Benefits - Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Market Risk Benefit [Line Items]
Asset	$ 372	$ 286
Liability	2,581	3,179
Net	2,209	2,893
Asia
Market Risk Benefit [Line Items]
Net	215	234
MetLife Holdings
Market Risk Benefit [Line Items]
Net	2,069	2,722
Retirement Assurance | Asia
Market Risk Benefit [Line Items]
Asset	0	0
Liability	178	203
Net	178	203	$ 226	$ 277
Investment Product | MetLife Holdings
Market Risk Benefit [Line Items]
Asset	231	156
Liability	2,300	2,878
Net	2,069	2,722
Insurance, Other
Market Risk Benefit [Line Items]
Asset	141	130
Liability	103	98
Net	$ (38)	$ (32)	$ 32	$ 491