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Pensions and Other Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Benefit Cost
The net periodic pension and other postretirement benefit costs for the three and nine months ended September 30, 2021 and 2020 were as follows:
 Pension
 Three Months Ended
September 30
Nine Months Ended
September 30
($ in millions)2021202020212020
Service cost$3 $6 $8 $18 
Interest cost17 22 49 65 
Expected return on plan assets(38)(36)(114)(108)
Amortization of actuarial losses10 17 30 53 
Curtailments— — — 
Net periodic benefit cost($8)$9 ($27)$29 
 Other Postretirement Benefits
 Three Months Ended
September 30
Nine Months Ended
September 30
($ in millions)2021202020212020
Service cost$3 $2 $9 $7 
Interest cost10 15 
Amortization of actuarial losses15 12 
Amortization of prior service credit(14)(14)(41)(44)
Net periodic benefit cost($3)($3)($7)($10)
Defined Contribution Plan Disclosures
Three Months Ended
September 30
Nine Months Ended
September 30
($ in millions)2021202020212020
Non-U.S. defined benefit pension mandatory contributions$1 $2 $3 $7