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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2022
Subsequent Events [Abstract]
Subsequent Events [Text Block]	15. Subsequent Events Senior Notes In July 2022, MetLife, Inc. issued $1.0 billion of senior notes due July 2052 which bear interest at a fixed rate of 5.00%, payable semi-annually. In connection with the issuance, MetLife, Inc. incurred $11 million of related costs which will be amortized over the term of the senior notes.