Deferred Policy Acquisition Costs, Value of Business Acquired and Unearned Revenue - Unearned Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Unearned Revenue [Roll Forward]
Deferred Revenue, Current, Beginning Balance	$ 4,635	$ 4,537
Deferrals	167	218
Amortization	(109)	(102)
Effect of foreign currency translation and other - net	41	(41)
Deferred Revenue, Current, Ending Balance	4,734	4,612
RIS
Unearned Revenue [Roll Forward]
Deferred Revenue, Current, Beginning Balance	27	31
Deferrals	1	1
Amortization	(2)	(2)
Effect of foreign currency translation and other - net	0	0
Deferred Revenue, Current, Ending Balance	26	30
Asia
Unearned Revenue [Roll Forward]
Deferred Revenue, Current, Beginning Balance	3,076	2,850
Deferrals	106	152
Amortization	(61)	(52)
Effect of foreign currency translation and other - net	6	(31)
Deferred Revenue, Current, Ending Balance	3,127	2,919
Latin America
Unearned Revenue [Roll Forward]
Deferred Revenue, Current, Beginning Balance	841	989
Deferrals	33	37
Amortization	(26)	(30)
Effect of foreign currency translation and other - net	16	4
Deferred Revenue, Current, Ending Balance	864	1,000
EMEA
Unearned Revenue [Roll Forward]
Deferred Revenue, Current, Beginning Balance	622	608
Deferrals	24	25
Amortization	(18)	(17)
Effect of foreign currency translation and other - net	19	(14)
Deferred Revenue, Current, Ending Balance	647	602
MetLife Holdings
Unearned Revenue [Roll Forward]
Deferred Revenue, Current, Beginning Balance	69	59
Deferrals	3	3
Amortization	(2)	(1)
Effect of foreign currency translation and other - net	0	0
Deferred Revenue, Current, Ending Balance	$ 70	$ 61