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Debt (Tables) | 12 Months Ended
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Dec. 31, 2019
Debt Disclosure [Abstract] |
Summary of Short-term and Long-term Debt Outstanding | A summary of long-term debt outstanding is as follows:
(in millions) | December 31,
| 2019 |  | 2018
3.3% Senior Notes, due 2020 1 | $ | — |  |  | $ | 698 |
4.0% Senior Notes, due 2025 2 | 694 |  |  | 693 |
4.4% Senior Notes, due 2026 3 | 893 |  |  | 892 |
2.95% Senior Notes, due 2027 4 | 493 |  |  | 493 |
2.5% Senior Notes, due 2029 5 | 495 |  |  | — |
6.55% Senior Notes, due 2037 6 | 294 |  |  | 396 |
4.5% Senior Notes, due 2048 7 | 490 |  |  | 490 |
3.25% Senior Notes, due 2049 8 | 589 |  |  | — |
Long-term debt | $ | 3,948 |  |  | $ | 3,662 |
1 | We made a $700 million early repayment of our 3.3% senior note in the fourth quarter of 2019.
2 | Interest payments are due semiannually on June 15 and December 15, and as of December 31, 2019, the unamortized debt discount and issuance costs total $6 million.
3 | Interest payments are due semiannually on February 15 and August 15, and as of December 31, 2019, the unamortized debt discount and issuance costs total $7 million.
4 | Interest payments are due semiannually on January 22 and July 22, and as of December 31, 2019, the unamortized debt discount and issuance costs total $7 million.
5 | Interest payments are due semiannually on June 1 and December 1, beginning on June 1, 2020, and as of December 31, 2019, the unamortized debt discount and issuance costs total $5 million.
6 | We made a $103 million early repayment of a portion of our 6.55% senior note in November of 2019. Interest payments are due semiannually on May 15 and November 15, and as of December 31, 2019, the unamortized debt discount and issuance costs total $3 million.
7 | Interest payments are due semiannually on May 15 and November 15, and as of December 31, 2019, the unamortized debt discount and issuance costs total $10 million.
8 Interest payments are due semiannually on June 1 and December 1, beginning on June 1, 2020, and as of December 31, 2019, the unamortized debt discount and issuance costs total $11 million.

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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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