The carrying value of the Senior Notes as of the periods presented was as follows (amounts in millions): | | | | | | | | | | | | | | | | | | | April 30, | | January 29, | | Effective Interest Rate | | 2021 | | 2021 | | Senior Notes issued August 21, 2017: | | | | | | |
2.95% Senior Note Due August 21, 2022 | $ | 1,500 | | | $ | 1,500 | | | 3.17% | 3.90% Senior Note Due August 21, 2027 | 1,250 | | | 1,250 | | | 4.05% | Senior Notes issued April 7, 2020: | | | | | | 4.50% Senior Note Due May 15, 2025 | 750 | | | 750 | | | 4.70% | 4.65% Senior Note Due May 15, 2027 | 500 | | | 500 | | | 4.80% | 4.70% Senior Note Due May 15, 2030 | 750 | | | 750 | | | 4.86% | | Total principal amount | 4,750 | | | 4,750 | | | | | Less: unamortized discount | (6) | | | (7) | | | | | Less: unamortized debt issuance costs | (25) | | | (26) | | | | | Net carrying amount included in long-term debt | $ | 4,719 | | | $ | 4,717 | | | | |
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