Market Risk Benefits Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Jan. 01, 2021
Market Risk Benefit [Line Items]
Market risk benefits	$ 334	$ 280
Market Risk Benefit, Liability, Amount	2,738	3,763			$ 7,901
Market Risk Benefit, Net, Amount	2,404	3,483
Retirement Assurance | Asia
Market Risk Benefit [Line Items]
Market risk benefits	0	0
Market Risk Benefit, Liability, Amount	193	226
Market Risk Benefit, Net, Amount	193	226	$ 207	$ 277
Investment Product | MetLife Holdings
Market Risk Benefit [Line Items]
Market risk benefits	185	153
Market Risk Benefit, Liability, Amount	2,453	3,378
Market Risk Benefit, Net, Amount	2,268	3,225
Insurance, Other
Market Risk Benefit [Line Items]
Market risk benefits	149	127
Market Risk Benefit, Liability, Amount	92	159
Market Risk Benefit, Net, Amount	$ (57)	$ 32	$ 45	$ 491