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Post-retirement Benefit Plans
 6 Months Ended
Jun. 30, 2022
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)2022202120222021
Domestic defined benefit pension plans:
Service cost$— $— $1 $1 
Interest cost1 1 2 2 
Expected return on plan assets(1)(1)(3)(3)
Amortization of net actuarial loss— 1 1 2 
Net periodic benefit cost$— $1 $1 $2 
International defined benefit pension plans:
Service cost$4 $3 $7 $7 
Interest cost3 3 7 6 
Expected return on plan assets(3)(3)(7)(7)
Amortization of net actuarial loss3 4 6 8 
Net periodic benefit cost$7 $7 $13 $14 
Total net periodic benefit cost$7 $8 $14 $16 
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, 2022 and 2021, respectively.
We contributed $10 million and $12 million to our defined benefit plans during the six months ended June 30, 2022 and 2021, respectively. Additional contributions ranging between approximately $7 million and $13 million are expected to be made during the remainder of 2022.    
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.