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Debt Obligations (Tables) | 9 Months Ended
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Sep. 30, 2018
Debt Disclosure [Abstract] |
Changes in Debt Obligations | The following table presents the changes in the carrying amount of our debt obligations during the nine months ended September 30, 2018:
| December 31, 2017 |  | Additions |  | Payments, Accretion and Other |  | September 30, 2018
Short-term debt: | (in millions)
Commercial paper | $ | 480 |  |  | $ | 3,192 |  |  | $ | (3,363 | ) |  | $ | 309 |
Senior unsecured floating rate notes due March 22, 2019(1) | 498 |  |  | — |  |  | 1 |  |  | 499 |
Total short-term debt | 978 |  |  | 3,192 |  |  | (3,362 | ) |  | 808 |
Long-term debt: |  |  |  |  |  |  |
5.55% senior unsecured notes due January 15, 2020 | 599 |  |  | — |  |  | — |  |  | 599 |
3.875% senior unsecured notes due June 7, 2021 | 716 |  |  | — |  |  | (22 | ) |  | 694 |
4.25% senior unsecured notes due June 1, 2024 | 496 |  |  | — |  |  | 1 |  |  | 497 |
1.75% senior unsecured notes due May 19, 2023 | 712 |  |  | — |  |  | (22 | ) |  | 690 |
3.85% senior unsecured notes due June 30, 2026 | 496 |  |  | — |  |  | — |  |  | 496 |
$400 million senior unsecured term loan facility due November 25, 2019 (average interest rate of 3.37% for the period January 1, 2018 through September 30, 2018) | 100 |  |  | — |  |  | — |  |  | 100 |
$1 billion revolving credit commitment due April 25, 2022 (average interest rate of 2.74% for the period January 1, 2018 through September 30, 2018) | 110 |  |  | — |  |  | (114 | ) |  | (4 | )
Total long-term debt | 3,229 |  |  | — |  |  | (157 | ) |  | 3,072 |
Total debt obligations | $ | 4,207 |  |  | $ | 3,192 |  |  | $ | (3,519 | ) |  | $ | 3,880 |
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(1) | Balance was reclassified to short-term debt as of March 31, 2018.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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