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Other (Income) Expense, Net
 9 Months Ended
Sep. 30, 2021
Other Income and Expenses [Abstract]  
Other (Income) Expense, Net Other (Income) Expense, Net
Other (income) expense, net, consisted of:
Three Months Ended September 30,Nine Months Ended September 30,
($ in millions)2021202020212020
Exchange (gains) losses $1 $18 $6 $52 
Interest expense98 — 160—
Other, net3 (8)16 (8)
 $102 $10 $182 $44 
Interest expense for the three and nine months of 2021 primarily reflects amounts incurred in connection with the issuance of debt during the second quarter. See Note 9 for details.