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RETIREMENT BENEFIT PLANS
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
RETIREMENT BENEFIT PLANS RETIREMENT BENEFIT PLANS
The Company has a number of defined benefit pension plans and other postretirement benefit plans covering eligible salaried and hourly employees and their dependents. The estimated contributions to the Company's defined benefit pension plans for 2021 range from $15 million to $25 million, of which $12 million has been contributed through the first six months of the year. The other postretirement benefit plans, which provide medical and life insurance benefits, are funded on a pay-as-you-go basis.

The components of net periodic benefit (income) cost recorded in the Condensed Consolidated Statements of Operations are as follows:
 Pension benefitsOther postretirement
employee benefits
(in millions)20212020
Three Months Ended June 30,USNon-USUSNon-US20212020
Service cost$— $7 $— $5 $— $— 
Interest cost— 7 2 3 — — 
Expected return on plan assets(2)(21)(2)(6)— — 
Amortization of unrecognized prior service credit— — — — (1)— 
Amortization of unrecognized loss— 4 — 2 1 — 
Net periodic benefit (income) cost$(2)$(3)$— $4 $— $— 
Pension benefitsOther postretirement
employee benefits
(in millions)20212020
Six Months Ended June 30,USNon-USUSNon-US20212020
Service cost$— $13 $— $10 $— $— 
Interest cost1 15 3 5 — 1 
Expected return on plan assets(5)(42)(5)(12)— — 
Amortization of unrecognized prior service credit— — — — (1)(1)
Amortization of unrecognized loss1 7 1 5 1 — 
Net periodic benefit (income) cost$(3)$(7)$(1)$8 $— $— 


The components of net periodic benefit (income) cost other than the service cost component are included in Other postretirement income in the Condensed Consolidated Statements of Operations.