Financial report context:
fidelity national information services , inc . and subsidiaries notes to consolidated financial statements - ( continued ) the following summarizes the aggregate maturities of our debt and capital leases on stated contractual maturities , excluding unamortized non-cash bond premiums and discounts net of $ 30 million as of december 31 , 2017 ( in millions ) : .

Financial table:
total: 2018; column_2: $ 1045
total: 2019; column_2: 44
total: 2020; column_2: 1157
total: 2021; column_2: 1546
total: 2022; column_2: 705
total: thereafter; column_2: 4349
total: total principal payments; column_2: 8846
total: debt issuance costs net of accumulated amortization; column_2: -53 ( 53 )
total: total long-term debt; column_2: $ 8793

Additional report context:
there are no mandatory principal payments on the revolving loan and any balance outstanding on the revolving loan will be due and payable at its scheduled maturity date , which occurs at august 10 , 2021 . fis may redeem the 2018 notes , 2020 notes , 2021 notes , 2021 euro notes , 2022 notes , 2022 gbp notes , 2023 notes , 2024 notes , 2024 euro notes , 2025 notes , 2026 notes , and 2046 notes at its option in whole or in part , at any time and from time to time , at a redemption price equal to the greater of 100% ( 100 % ) of the principal amount to be redeemed and a make-whole amount calculated as described in the related indenture in each case plus accrued and unpaid interest to , but excluding , the date of redemption , provided no make-whole amount will be paid for redemptions of the 2020 notes , the 2021 notes , the 2021 euro notes and the 2022 gbp notes during the one month prior to their maturity , the 2022 notes during the two months prior to their maturity , the 2023 notes , the 2024 notes , the 2024 euro notes , the 2025 notes , and the 2026 notes during the three months prior to their maturity , and the 2046 notes during the six months prior to their maturity . debt issuance costs of $ 53 million , net of accumulated amortization , remain capitalized as of december 31 , 2017 , related to all of the above outstanding debt . we monitor the financial stability of our counterparties on an ongoing basis . the lender commitments under the undrawn portions of the revolving loan are comprised of a diversified set of financial institutions , both domestic and international . the failure of any single lender to perform its obligations under the revolving loan would not adversely impact our ability to fund operations . the fair value of the company 2019s long-term debt is estimated to be approximately $ 156 million higher than the carrying value as of december 31 , 2017 . this estimate is based on quoted prices of our senior notes and trades of our other debt in close proximity to december 31 , 2017 , which are considered level 2-type measurements . this estimate is subjective in nature and involves uncertainties and significant judgment in the interpretation of current market data . therefore , the values presented are not necessarily indicative of amounts the company could realize or settle currently. .

Question: what percent of total long-term debt is due in 2021?
Answer: 18%