Additional borrowing capacity (up to)

  
for origination technology revenue consist of a series of distinct services and are recognized over the contract terms as subscription performance obligations are satisfied. Contracts generally range from one year to five years.  
Included in the amortization recognized in 2021, $152 million related to the deferred revenue balance as of January 1, 2021. Included in the amortization in 2020, $123 million related to the deferred revenue balance as of January 1, 2020. As of December 31, 2021, we estimate that our deferred revenue will be recognized in the following years (in millions):

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  | Original Listing Revenues |  | Other Listing Revenues |  | Data Services and Other Revenues |  | Mortgage Technology |  | Total |
| 2022 |  |  | $ | 16  |  |  | $ | 29  |  |  | $ | 84  |  |  | $ | 65  |  |  | $ | 194  |  |
| 2023 |  |  | 3  |  |  | 25  |  |  | 3  |  |  | 9  |  |  | 40  |  |
| 2024 |  |  | —  |  |  | 18  |  |  | 3  |  |  | 4  |  |  | 25  |  |
| 2025 |  |  | —  |  |  | 13  |  |  | 1  |  |  | 1  |  |  | 15  |  |
| 2026 |  |  | —  |  |  | 7  |  |  | 1  |  |  | —  |  |  | 8  |  |
| Thereafter  |  |  | —  |  |  | 1  |  |  | 1  |  |  | —  |  |  | 2  |  |
| Total  |  |  | $ | 19  |  |  | $ | 93  |  |  | $ | 93  |  |  | $ | 79  |  |  | $ | 284  |  |

      
10.DebtOur total debt, including short-term and long-term debt, consisted of the following (in millions):

|  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | As of December 31, |  |
|  | 2021 |  | 2020 |  |
| Debt: |  |  |  |  |
| Short-term debt: |  |  |  |  |
| Commercial Paper | $ | 1,012  |  |  | $ | 2,405  |  |  |
|  |  |  |  |  |
| 2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022) | 499  |  |  | —  |  |  |
| Other short-term debt | 10  |  |  | 6  |  |  |
| Total short-term debt  | 1,521  |  |  | 2,411  |  |  |
| Long-term debt: |  |  |  |  |
|  |  |  |  |  |
| 2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022) | —  |  |  | 498  |  |  |
| 2023 Senior Notes (floating rate senior unsecured notes due June 15, 2023) | —  |  |  | 1,244  |  |  |
| 2023 Senior Notes (0.70% senior unsecured notes due June 15, 2023) | 997  |  |  | 995  |  |  |
| 2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023) | 399  |  |  | 398  |  |  |
| 2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023)  | 797  |  |  | 796  |  |  |
| 2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025) | 1,246  |  |  | 1,245  |  |  |
| 2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027) | 497  |  |  | 496  |  |  |
| 2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028) | 594  |  |  | 593  |  |  |
| 2030 Senior Notes (2.10% senior unsecured notes due June 15, 2030) | 1,234  |  |  | 1,232  |  |  |
| 2032 Senior Notes (1.85% senior unsecured notes due September 15, 2032) | 1,483  |  |  | 1,481  |  |  |
| 2040 Senior Notes (2.65% senior unsecured notes due September 15, 2040) | 1,230  |  |  | 1,229  |  |  |
| 2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048) | 1,230  |  |  | 1,230  |  |  |
| 2050 Senior Notes (3.00% senior unsecured notes due June 15, 2050) | 1,220  |  |  | 1,219  |  |  |
| 2060 Senior Notes (3.00% senior unsecured notes due September 15, 2060) | 1,470  |  |  | 1,470  |  |  |
| Total long-term debt | 12,397  |  |  | 14,126  |  |  |
| Total debt | $ | 13,918  |  |  | $ | 16,537  |  |  |
|  |  |  |  |  |
|  |  |  |  |  |
|  |  |  |  |  |
|  |  |  |  |  |

Credit Facilities•Credit Facility: We have a $3.8 billion senior unsecured revolving credit facility, or the Credit Facility, with future capacity to increase our borrowings under the Credit Facility by an additional $625 million, subject to the consent of the lenders funding the increase and certain other conditions. On October 15, 2021, we agreed with the lenders 115
