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Other (Income) Expense, Net
 6 Months Ended
Jun. 30, 2021
Other Income and Expenses [Abstract]  
Other (Income) Expense, Net Other (Income) Expense, Net
Other (income) expense, net, consisted of: 
 Three Months Ended
June 30,		Six Months Ended
June 30,
($ in millions)2021202020212020
Interest income$(9)$(14)$(20)$(39)
Interest expense202 209 401 421 
Exchange losses114 24 155 78 
Income from investments in equity securities, net (1)
(280)(551)(854)(603)
Net periodic defined benefit plan (credit) cost other than service cost(110)(80)(199)(170)
Other, net(20)25 (41)(12)
 $(103)$(387)$(558)$(325)
(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 ownership interests in investment funds are accounted for on a one quarter lag. The Company estimates that gains of approximately $380 million will be recorded in the third quarter of 2021 from ownership interests in investment funds.
Interest paid for the six months ended June 30, 2021 and 2020 was $363 million and $387 million, respectively.