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Employee Benefit and Retirement Plans
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Employee Benefit and Retirement Plans Employee Benefit and Retirement Plans
The components of pension and postretirement benefit (income) expense for the periods indicated, are as follows (in millions):
Pension Benefits
Three Months Ended June 30,
U.S.International
2021202020212020
Service cost$— $— $1 $1 
Interest cost5 9 1 3 
Expected return on plan assets(13)(15)(1)(1)
Amortization6 6 1 — 
Total (income) expense$(2)$— $2 $3 
Pension Benefits
Six Months Ended June 30,
U.S.International
2021202020212020
Service cost$— $— $2 $2 
Interest cost10 18 3 5 
Expected return on plan assets(25)(30)(2)(3)
Amortization11 12 2 1 
Settlements— 1 — — 
Total (income) expense$(4)$1 $5 $5 
Postretirement Benefits
Three Months Ended
June 30, 		Six Months Ended
June 30,
2021202020212020
Interest cost$— $1 $— $1 
Amortization(1)(2)(2)(3)
Total income$(1)$(1)$(2)$(2)