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Post-retirement Benefit Plans
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Post-retirement Benefit Plans Post-retirement Benefit Plans
The components of net periodic benefit cost for our defined benefit pension plans are as follows:
Three Months EndedSix Months Ended
 June 30,June 30,
(in millions)2021202020212020
Domestic defined benefit pension plans:
Service cost$— $1 $1 $2 
Interest cost1 1 2 2 
Expected return on plan assets(1)(2)(3)(4)
Amortization of net actuarial loss1 1 2 2 
Net periodic benefit cost$1 $1 $2 $2 
International defined benefit pension plans:
Service cost$3 $3 $7 $6 
Interest cost3 3 6 6 
Expected return on plan assets(3)(3)(7)(6)
Amortization of net actuarial loss4 3 8 6 
Net periodic benefit cost$7 $6 $14 $12 
Total net periodic benefit cost$8 $7 $16 $14 
The components of net periodic benefit cost, other than the service cost component, are included in the line item "Other non-operating expense, net" in the Condensed Consolidated Income Statements.
The total net periodic benefit cost for other post-retirement employee benefit plans was less than $1 million, including net credits recognized into other comprehensive income of less than $1 million, for both the three and six months ended June 30, 2021 and 2020, respectively.
We contributed $12 million and $16 million to our defined benefit plans during the six months ended June 30, 2021 and 2020, respectively. Additional contributions ranging between approximately $7 million and $15 million are expected to be made during the remainder of 2021.
During the first quarter of 2020, the Company purchased a bulk annuity policy with an insurance company for its largest defined benefit plan in the U.K., as a plan asset, to facilitate the termination and buy-out of the plan. The bulk annuity fully insures the benefits payable to the participants of the plan until a full buy-out of the plan can be executed, which is expected to occur in 2022. Included in the Company's six months ended June 30, 2020 contributions is $5 million paid to meet the shortfall between the cost of the bulk annuity policy and the plan assets.