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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2022
Subsequent Events [Abstract]
Subsequent Events [Text Block]	22. Subsequent Events Senior Notes In February 2023, MetLife, Inc. redeemed for cash and canceled $1.0 billion aggregate principal amount of its outstanding 4.368% senior notes due September 2023. In January 2023, MetLife, Inc. issued $1.0 billion of senior notes due January 2054 which bear interest at a fixed rate of 5.250%, 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.