| Schedule of long-term debt |
The following is a summary of long-term debt at December 31: | | | | | | | (in millions) | | 2019 | | 2018 | 0.00% Notes, due 2020 | | $ | 1,272 | | $ | 1,300 | 2.80% Notes, due 2020 | | | — | | | 500 | 2.90% Notes, due 2021 | | | — | | | 2,850 | 2.55% Notes, due 2022 | | | 750 | | | 750 | 0.875% Notes, due 2023 | | | 1,272 | | | 1,303 | 3.40% Notes, due 2023 | | | 1,050 | | | 1,050 | 5-year term loan due 2024 | | | 546 | | | — | 0.10% Notes, due 2024 | | | 658 | | | — | 3.875% Notes, due 2025 | | | 500 | | | 500 | 2.95% Notes, due 2025 | | | 1,000 | | | 1,000 | 1.50% Notes, due 2026 | | | 1,272 | | | 1,300 | 3.75% Notes, due 2026 | | | 1,700 | | | 1,700 | 0.375% Notes, due 2027 | | | 658 | | | — | 4.75% Notes, due 2036 | | | 1,650 | | | 1,650 | 6.15% Notes, due 2037 | | | 547 | | | 547 | 6.00% Notes, due 2039 | | | 515 | | | 515 | 5.30% Notes, due 2040 | | | 694 | | | 694 | 4.75% Notes, due 2043 | | | 700 | | | 700 | 4.90% Notes, due 2046 | | | 3,250 | | | 3,250 | Unamortized debt issuance costs | | | (90) | | | (102) | Other, including fair value adjustments relating to interest rate hedge contracts designated as fair value hedges | | | (6) | | | (141) | Total carrying amount of long-term debt | | | 17,938 | | | 19,366 | Less: Current portion | | | 1,277 | | | 7 | Total long-term portion | | $ | 16,661 | | $ | 19,359 |
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