Market Risk Benefits Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Jan. 01, 2021
Market Risk Benefit [Line Items]
Market risk benefits	$ 227	$ 280
Market Risk Benefit, Liability, Amount	3,869	3,763			$ 7,901
Market Risk Benefit, Net, Amount	3,642	3,483
Retirement Assurance | Asia
Market Risk Benefit [Line Items]
Market risk benefits	0	0
Market Risk Benefit, Liability, Amount	221	226
Market Risk Benefit, Net, Amount	221	226	$ 257	$ 277
Investment Product | MetLife Holdings
Market Risk Benefit [Line Items]
Market risk benefits	108	153
Market Risk Benefit, Liability, Amount	3,469	3,378
Market Risk Benefit, Net, Amount	3,361	3,225
Insurance, Other
Market Risk Benefit [Line Items]
Market risk benefits	119	127
Market Risk Benefit, Liability, Amount	179	159
Market Risk Benefit, Net, Amount	$ 60	$ 32	$ 338	$ 491