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Post-retirement Benefit Plans
 9 Months Ended
Sep. 30, 2023
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 EndedNine Months Ended
 September 30,September 30,
(in millions)2023202220232022
Domestic defined benefit pension plans:
Service cost$— $1 $2 $2 
Interest cost2 — 4 2 
Expected return on plan assets(1)(1)(4)(4)
Amortization of net actuarial loss— 1 — 2 
Net periodic benefit cost$1 $1 $2 $2 
International defined benefit pension plans:
Service cost$2 $3 $5 $10 
Interest cost4 4 12 11 
Expected return on plan assets(3)(4)(9)(11)
Amortization of actuarial (gain) loss(1)3 (2)9 
U.K. pension settlement expense— 140 — 140 
Net periodic benefit cost$2 $146 $6 $159 
Total net periodic benefit cost$3 $147 $8 $161 
The components of net periodic benefit cost, other than the service cost component are included in the line item "Other non-operating income, 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 (loss)" of less than $1 million, for both the three and nine months ended September 30, 2023 and 2022, respectively.
We contributed $20 million and $15 million to our defined benefit plans for the nine months ended September 30, 2023 and 2022, respectively. Additional contributions of up to $3 million are expected to be made during the remainder of 2023.