pre_text: As at December 31, 2019, we had US$8.3 billion of US dollardenominated senior notes and debentures, all of which were hedged using debt derivatives. 1 US dollar-denominated long-term debt reflects the hedged exchange rate and the hedged interest rate. 2 Pursuant to the requirements for hedge accounting under IFRS 9, Financial instruments, as at December 31, 2019 and December 31, 2018, RCI accounted for 100% of its debt derivatives related to senior notes as hedges against designated US dollar-denominated debt. As a result, as at December 31, 2019 and 2018, 100% of our US dollar-denominated senior notes and debentures are hedged for accounting and economic purposes. 3 Borrowings include long-term debt, including the impact of debt derivatives, and short-term borrowings associated with our US CP and accounts receivable securitization programs.
table: As at December 31
table: (In millions of dollars, except exchange rates, percentages, and years) 2019 2018
table: US dollar-denominated long-term debt 1 US$ 8,300 US$ 6,050
table: Hedged with debt derivatives US$ 8,300 US$ 6,050
table: Hedged exchange rate 1.1932 1.1438
table: Percent hedged2 100.0% 100.0%
table: Amount of borrowings at fixed rates 3
table: Total borrowings $ 17,496 $ 15,320
table: Total borrowings at fixed rates $ 15,254 $ 13,070
table: Percent of borrowings at fixed rates 87.2% 85.3%
table: Weighted average interest rate on borrowings 4.30% 4.45%
table: Weighted average term to maturity 14.1 years 10.7 years
question: Analyse this data from a financial earnings document. What was the increase / (decrease) in US dollar-denominated long-term debt from 2018 to 2019?