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Other (Income) Expense, Net
 3 Months Ended
Mar. 31, 2024
Other Income and Expenses [Abstract]  
Other (Income) Expense, Net Other (Income) Expense, Net
Other (income) expense, net, consisted of: 
 Three Months Ended
March 31,
($ in millions)20242023
Interest income$(73)$(112)
Interest expense303 242 
Exchange losses83 61 
Income from investments in equity securities, net (1)
(143)(450)
Net periodic defined benefit plan (credit) cost other than service cost(160)(115)
Other, net(43)463 
 $(33)$89 
(1)    Includes net realized and unrealized gains and losses from investments in equity securities either owned directly or through ownership interests in investment funds. Unrealized gains and losses from investments that are directly owned are determined at the end of the reporting period, while gains and losses from ownership interests in investment funds are accounted for on a one quarter lag.
Other, net (as reflected in the table above) in the first three months of 2023 includes a $572.5 million charge related to settlements with certain plaintiffs in the Zetia antitrust litigation (see Note 7).
Interest paid for the three months ended March 31, 2024 and 2023 was $217 million and $208 million, respectively.