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RETIREMENT PLANS AND POST RETIREMENT PENSION PLANS (Tables)
 6 Months Ended
Apr. 30, 2021
Defined Benefit Plan, Net Periodic Benefit Cost  
Schedule of net pension and post-retirement benefit costs
Components of net periodic costs (benefits). For the three and six months ended April 30, 2021 and 2020, our net pension and post retirement benefit costs (benefits) were comprised of the following:
 
Three Months Ended April 30,
 U.S.
Pension Plans		Non-U.S.
Pension Plans		U.S. Post Retirement
Benefit Plans
 202120202021202020212020
 (in millions)
Service cost—benefits earned during the period$— $— $4 $5 $— $— 
Interest cost on benefit obligation4 4 2 2 1 1 
Expected return on plan assets(8)(7)(13)(12)(1)(2)
Amortization:
Actuarial losses1 1 14 12 1 1 
Prior service credits— — — — (1)(2)
Total net plan costs (benefits)$(3)$(2)$7 $7 $— $(2)
Six Months Ended April 30,
 U.S.
Pension Plans		Non-U.S.
Pension Plans		U.S. Post Retirement
Benefit Plans
 202120202021202020212020
 (in millions)
Service cost—benefits earned during the period$— $— $11 $12 $— $— 
Interest cost on benefit obligation7 8 4 4 2 2 
Expected return on plan assets(15)(15)(25)(24)(3)(3)
Amortization:
Actuarial losses2 2 27 24 2 2 
Prior service credits— — — — (1)(4)
Total net plan costs (benefits)$(6)$(5)$17 $16 $— $(3)
The service cost component is recorded in cost of sales and operating expenses in the condensed consolidated statement of operations. All other cost components are recorded in other income (expense), net in the condensed consolidated statement of operations.
Employer Contributions and Expected Employer Contributions
Employer contributions and expected future employer contributions for the remainder of the year were as follows:
Three Months EndedSix Months Ended Employer Contributions
April 30,April 30,For Remainder of Year
20212020202120202021
(in millions)
U.S. defined benefit plans$— $— $— $— $— 
Non-U.S. defined benefit plans$4 $14 $9 $19 $13