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Supplemental Income Statement Information
 9 Months Ended
Sep. 30, 2021
Other Income and Expenses [Abstract]  
Supplemental Income Statement Information Supplemental Income Statement Information
Other expense (income), net consists of the following:
Three months ended
September 30,		Nine months ended
September 30,
(Millions)2021202020212020
Interest expense$117$128$370$388
Interest income(6)(5)(18)(24)
Pension and postretirement net periodic benefit cost (benefit)(80)(40)(239)(116)
Total$31$83$113$248
Interest expense includes an early debt extinguishment pre-tax charge of approximately $11 million in the first quarter of 2021.
Pension and postretirement net periodic benefit costs described in the table above include all components of defined benefit plan net periodic benefit costs except service cost, which is reported in various operating expense lines. Refer to Note 11 for additional details on the components of pension and postretirement net periodic benefit costs.