Table:
|  |  |  | December 31, 2018 |
| --- | --- | --- | --- |
|  | Gross Carrying Amount | Unamortized Discount and Deferred Financing Costs | Net Carrying Amount |
| 2021 Notes | 650 | (3) | 647 |
| 2022 Notes | 400 | (3) | 397 |
| 2026 Notes | 850 | (8) | 842 |
| 2027 Notes | 400 | (5) | 395 |
| 2047 Notes | 400 | (10) | 390 |
| Total debt | $2,700 | $(29) | $2,671 |
Paragraphs:
A summary of our outstanding debt as of December 31, 2018, is as follows (amounts in millions):
Refer to Note 13 of the notes to the consolidated financial statements included in Item 8 of this Annual Report on Form 10-K for further disclosures regarding our debt obligations.
Question:
What was the change in gross carrying amount between the 2022 and 2026 notes?
Answer: 850-400 = 450