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Employee Retirement Benefits
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Employee Retirement Benefits Employee Retirement Benefits
The following summarizes the components of net periodic benefit cost for our qualified and supplemental pension plans:
(Dollars in millions)
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
2

 
$
3

 
$
6

 
$
8

Non-service costs (benefit):
 
 
 
 
 
 
 
 
Interest cost
 
4

 
4

 
10

 
10

Expected return on plan assets
 
(5
)
 
(6
)
 
(15
)
 
(17
)
Amortization of actuarial loss and prior
  service cost
 
—

 
—

 
1

 
1

Other
 
—

 
—

 
1

 
—

 Total non-service benefit
 
(1
)
 
(2
)
 
(3
)
 
(6
)
Net periodic benefit cost
 
$
1

 
$
1

 
$
3

 
$
2

 
 
 
 
 
 
 
 
 


See our 2018 Annual Report on Form 10-K, Item 8, Note 13, Employee Retirement Benefits, Page 166, for information on our retirement benefits. Service costs and non-service costs (benefit) are allocated in the same proportion primarily to the underwriting, acquisition and insurance expenses line item with the remainder allocated to the insurance losses and contract holders' benefits line item on the condensed consolidated statements of income for both 2019 and 2018.

We made matching contributions totaling $6 million and $5 million to our 401(k) and Top Hat savings plans during the third quarter of 2019 and 2018 and contributions of $15 million for both the first nine months of 2019 and 2018, respectively.

We made no contributions to our qualified pension plan during the first nine months of 2019.