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Supplemental Income Statement Information | 9 Months Ended
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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) |  | 2021 |  | 2020 |  | 2021 |  | 2020
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.

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- Definition The entire disclosure for the components of non-operating income or non-operating expense, including, but not limited to, amounts earned from dividends, interest on securities, gain (loss) on securities sold, equity earnings of unconsolidated affiliates, gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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