total debt, including short-term and long-term debt, consisted of the following as of June 30, 2016 and December 31, 2015 (in millions): | | | | | | | | | | As of June 30, 2016 | | As of December 31, 2015 | Debt: | | | | Commercial Paper | $ | 1,811 |
| | $ | 2,591 |
| Short-term debt | 1,811 |
| | 2,591 |
| NYSE USD Notes (2.00% senior unsecured notes due October 5, 2017) | 852 |
| | 852 |
| 2018 Senior Notes (2.50% senior unsecured notes due October 15, 2018) | 597 |
| | 597 |
| 2020 Senior Notes (2.75% senior unsecured notes due December 1, 2020) | 1,240 |
| | 1,239 |
| 2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023) | 789 |
| | 789 |
| 2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025) | 1,241 |
| | 1,240 |
| Long-term debt | 4,719 |
| | 4,717 |
| Total debt | $ | 6,530 |
| | $ | 7,308 |
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