Deferred Policy Acquisition Costs, Value of Business Acquired and Other Policy-Related Intangibles - Transition Table (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Balance at December 31, 2020	$ 17,994	$ 17,644	$ 16,935	$ 17,415		$ 13,446
Balance at January 1, 2021	17,994	17,644	16,935	17,415		13,446
Balance at December 31, 2020	1,856	2,009	2,010	2,391		2,943
Balance at January 1, 2021	1,856	2,009	2,010	2,391		2,943
Balance at December 31, 2020						2,113
Balance at January 1, 2021						2,113
Balance at December 31, 2020					666	738
Balance at January 1, 2021					666	738
Accounting Standards Update 2018-12
Segment Reporting Information [Line Items]
Balance at December 31, 2020					17,451
Removal of related amounts in AOCI					3,980
Other adjustments upon adoption of the LDTI standard					25
Balance at January 1, 2021					17,451
Balance at December 31, 2020					2,966
Removal of related amounts in AOCI					27
Other adjustments upon adoption of the LDTI standard					(4)
Balance at January 1, 2021					2,966
Balance at December 31, 2020					3,163
Removal of related amounts in AOCI					1,043
Other adjustments upon adoption of the LDTI standard					7
Balance at January 1, 2021					3,163
Reclassification of carrying amount of contracts and contract features that are market risk benefits					(72)
U.S.
Segment Reporting Information [Line Items]
Balance at December 31, 2020	603	532	488	464		409
Balance at January 1, 2021	603	532	488	464		409
Balance at December 31, 2020	18	19	21	22		25
Balance at January 1, 2021	18	19	21	22		25
Balance at December 31, 2020						42
Balance at January 1, 2021						42
U.S. | Accounting Standards Update 2018-12
Segment Reporting Information [Line Items]
Balance at December 31, 2020					409
Removal of related amounts in AOCI					0
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					409
Balance at December 31, 2020					25
Removal of related amounts in AOCI					0
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					25
Balance at December 31, 2020					42
Removal of related amounts in AOCI					0
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					42
Asia
Segment Reporting Information [Line Items]
Balance at December 31, 2020	10,304	10,270	9,690	10,058		7,432
Balance at January 1, 2021	10,304	10,270	9,690	10,058		7,432
Balance at December 31, 2020	1,134	1,290	1,302	1,593		1,901
Balance at January 1, 2021	1,134	1,290	1,302	1,593		1,901
Balance at December 31, 2020						587
Balance at January 1, 2021						587
Asia | Accounting Standards Update 2018-12
Segment Reporting Information [Line Items]
Balance at December 31, 2020					9,741
Removal of related amounts in AOCI					2,309
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					9,741
Balance at December 31, 2020					1,915
Removal of related amounts in AOCI					14
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					1,915
Balance at December 31, 2020					1,616
Removal of related amounts in AOCI					1,029
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					1,616
Latin America
Segment Reporting Information [Line Items]
Balance at December 31, 2020	1,822	1,542	1,403	1,361		1,344
Balance at January 1, 2021	1,822	1,542	1,403	1,361		1,344
Balance at December 31, 2020	558	545	523	591		748
Balance at January 1, 2021	558	545	523	591		748
Balance at December 31, 2020						740
Balance at January 1, 2021						740
Latin America | Accounting Standards Update 2018-12
Segment Reporting Information [Line Items]
Balance at December 31, 2020					1,394
Removal of related amounts in AOCI					50
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					1,394
Balance at December 31, 2020					756
Removal of related amounts in AOCI					8
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					756
Balance at December 31, 2020					835
Removal of related amounts in AOCI					95
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					835
EMEA
Segment Reporting Information [Line Items]
Balance at December 31, 2020	1,562	1,480	1,425	1,472		1,551
Balance at January 1, 2021	1,562	1,480	1,425	1,472		1,551
Balance at December 31, 2020	120	127	135	154		236
Balance at January 1, 2021	120	127	135	154		236
Balance at December 31, 2020						556
Balance at January 1, 2021						556
EMEA | Accounting Standards Update 2018-12
Segment Reporting Information [Line Items]
Balance at December 31, 2020					1,565
Removal of related amounts in AOCI					0
Other adjustments upon adoption of the LDTI standard					14
Balance at January 1, 2021					1,565
Balance at December 31, 2020					232
Removal of related amounts in AOCI					0
Other adjustments upon adoption of the LDTI standard					(4)
Balance at January 1, 2021					232
Balance at December 31, 2020					482
Removal of related amounts in AOCI					(81)
Other adjustments upon adoption of the LDTI standard					7
Balance at January 1, 2021					482
MetLife Holdings
Segment Reporting Information [Line Items]
Balance at December 31, 2020	3,673	3,791	3,899	4,029		2,679
Balance at January 1, 2021	3,673	3,791	3,899	4,029		2,679
Balance at December 31, 2020	26	28	29	31		33
Balance at January 1, 2021	26	28	29	31		33
Balance at December 31, 2020						188
Balance at January 1, 2021						188
MetLife Holdings | Accounting Standards Update 2018-12
Segment Reporting Information [Line Items]
Balance at December 31, 2020					4,311
Removal of related amounts in AOCI					1,621
Other adjustments upon adoption of the LDTI standard					11
Balance at January 1, 2021					4,311
Balance at December 31, 2020					38
Removal of related amounts in AOCI					5
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					38
Balance at December 31, 2020					188
Removal of related amounts in AOCI					0
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					188
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Balance at December 31, 2020	30	29	30	31		31
Balance at January 1, 2021	30	29	30	31		31
Balance at December 31, 2020	0	0	0	0		0
Balance at January 1, 2021	$ 0	$ 0	$ 0	$ 0		0
Balance at December 31, 2020						0
Balance at January 1, 2021						$ 0
Corporate and Other [Member] | Accounting Standards Update 2018-12
Segment Reporting Information [Line Items]
Balance at December 31, 2020					31
Removal of related amounts in AOCI					0
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					31
Balance at December 31, 2020					0
Removal of related amounts in AOCI					0
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					0
Balance at December 31, 2020					0
Removal of related amounts in AOCI					0
Other adjustments upon adoption of the LDTI standard					0
Balance at January 1, 2021					$ 0