Market Risk Benefits Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021	Jan. 01, 2021
Market Risk Benefit [Line Items]
Market risk benefits	$ 279	$ 280
Market Risk Benefit, Liability, Amount	3,259	3,763			$ 7,901
Market Risk Benefit, Net, Amount	2,980	3,483
Retirement Assurance | Asia
Market Risk Benefit [Line Items]
Market risk benefits	0	0
Market Risk Benefit, Liability, Amount	202	226
Market Risk Benefit, Net, Amount	202	226	$ 224	$ 277
Investment Product | MetLife Holdings
Market Risk Benefit [Line Items]
Market risk benefits	146	153
Market Risk Benefit, Liability, Amount	2,939	3,378
Market Risk Benefit, Net, Amount	2,793	3,225
Insurance, Other
Market Risk Benefit [Line Items]
Market risk benefits	133	127
Market Risk Benefit, Liability, Amount	118	159
Market Risk Benefit, Net, Amount	$ (15)	$ 32	$ 199	$ 491