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Post-retirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Components of net periodic benefit cost and other amounts recognized in other comprehensive income 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