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Supplemental Income Statement Information | 3 Months Ended
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Mar. 31, 2021
Supplemental Income Statement Information |
Supplemental Income Statement Information | ​ NOTE 6. Supplemental Income Statement Information ​ Other expense (income), net consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended
​ | ​ | March 31,
(Millions) | ​ | 2021 |  | 2020
Interest expense | ​ | $ | 132 | ​ | $ | 123
Interest income | ​ |  | (4) | ​ |  | (10)
Pension and postretirement net periodic benefit cost (benefit) | ​ | ​ | (79) | ​ | ​ | (38)
Total | ​ | $ | 49 | ​ | $ | 75
​ 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.

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