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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	15. Subsequent Events Common Stock Repurchases In the second quarter of 2018 through April 30, 2018, MetLife, Inc. repurchased 7,630,398 shares of its common stock in the open market for $350 million. Common Stock Dividend On April 24, 2018, the MetLife, Inc. Board of Directors declared a second quarter 2018 common stock dividend of $0.42 per share payable on June 13, 2018 to shareholders of record as of May 7, 2018. The Company estimates that the aggregate dividend payment will be $428 million.