Table:
|  |  |  | (dollars in millions)  Increase/ (Decrease) | Increase/ (Decrease) |
| --- | --- | --- | --- | --- |
| Years Ended December 31, | 2019 | 2018 | (dollars in millions) | 2019 vs. 2018 |
| Interest income | $ 121 | $ 94 | $ 27 | 28.7% |
| Other components of net periodic benefit cost | 627 | 3,068 | (2,441) | (79.6) |
| Early debt extinguishment costs | (3,604) | (725) | (2,879) | nm |
| Other, net | (44) | (73) | 29 | 39.7 |
| Total | $ (2,900) | $2,364 | $ (5,264) | nm |
Paragraphs:
Other Income (Expense), Net
Additional information relating to Other income (expense), net is as follows:
nm -not meaningful
The change in Other income (expense), net during the year ended December 31, 2019, compared to the similar period in 2018, was primarily driven by early debt redemption costs of $3.6 billion recorded during 2019, compared to $725 million recorded during 2018 (see “Special Items”) as well as pension and benefit charges of $126 million recorded in 2019, compared with pension and benefit credits of $2.1 billion recorded in 2018 (see “Special Items”).
Question:
What was the early debt redemption costs during 2019?