. debt repayments : in july and august 2018 , we repaid $ 2.7 billion aggregate principal amount of senior notes that matured in the period . we funded these long-term debt repayments primarily with proceeds from the new notes issued in june 2018 . additionally , in june 2017 , we repaid $ 2.0 billion aggregate principal amount of senior notes that matured in the period . we funded these long-term debt repayments primarily with cash on hand and our commercial paper programs