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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Employee Benefit Plans 12. Employee Benefit Plans
Pension and Other Postretirement Benefit Plans
Certain subsidiaries of MetLife, Inc. sponsor a U.S. qualified and various U.S. and non-U.S. nonqualified defined benefit pension plans covering employees who meet specified eligibility requirements. These subsidiaries also provide certain postemployment benefits and certain postretirement medical and life insurance benefits for U.S. and non-U.S. retired employees.
The components of net periodic benefit costs, reported in other expenses, were as follows:
 
 
Three Months
Ended
March 31,
 
 
2020
 
2019
 
 
Pension
Benefits
 
Other
Postretirement
Benefits
 
Pension
Benefits
 
Other
Postretirement
Benefits
 
 
(In millions)
Service costs
 
$
62

 
$
1

 
$
58


$
1

Interest costs
 
89

 
10

 
104

 
13

Expected return on plan assets
 
(132
)
 
(15
)
 
(122
)
 
(16
)
Amortization of net actuarial (gains) losses
 
45

 
(19
)
 
48

 
(12
)
Amortization of prior service costs (credit)
 
(4
)
 
(1
)
 
(4
)
 
(3
)
Net periodic benefit costs (credit)
 
$
60

 
$
(24
)
 
$
84

 
$
(17
)