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Supplemental Income (Loss) Statement Information
 12 Months Ended
Dec. 31, 2023
Other Income and Expenses [Abstract]  
Supplemental Income (Loss) Statement Information
NOTE 6. Supplemental Income (Loss) Statement Information
Other expense (income), net consists of the following:
(Millions)202320222021
Interest expense$942$462$488 
Interest income(253)(67)(26)
Pension and postretirement net periodic benefit cost (benefit)(129)(248)(297)
Total$560$147$165 
Interest expense includes $566 million, $462 million and $488 million in 2023, 2022 and 2021, respectively, related to outstanding debt. Beginning in 2023, interest expense also includes imputed interest associated with the obligations resulting from the PWS Settlement and the CAE Settlement (discussed in Note 18).
Pension and postretirement net periodic benefit income described in the table above include all components of defined benefit plan net periodic benefit cost (benefit) except service cost, which is reported in various operating expense lines. Refer to Note 14 for additional details on the components of pension and postretirement net periodic benefit cost (benefit).