The following table summarizes the financial statement classification and amount of gain/(loss) recognized on hedging instruments: The following table summarizes the effect of derivative and non-derivative instruments designated as hedging instruments in Other Comprehensive (Loss)/Income: The average amount of commercial paper outstanding was $19 million and $389 million at a weighted-average interest rate of 1.27% and 1.17% during 2018 and 2017, respectively. The maximum amount of commercial paper outstanding was $300 million with no outstanding borrowings at December 31, 2018. The maximum amount of commercial paper outstanding was $1.3 billion with $299 million outstanding borrowings at December 31, 2017. 84 Short-term debt obligations include: Debt Obligations (a) The amount is expected to be reclassified into earnings in the next 12 months. Year Ended December 31, Dollars in Millions 2018 2017 2016 Derivatives qualifying as cash flow hedges Foreign currency forward contracts gain/(loss): Recognized in Other Comprehensive (Loss)/Income (a) $ 86 $ (108 ) $ 6 Reclassified to Cost of products sold (4) (12) 20 Reclassified to Other income (net) — 36 (8 ) Derivatives qualifying as net investment hedges Cross-currency interest rate swap contracts loss: Recognized in Other Comprehensive (Loss)/Income (5 ) — — Non-derivatives qualifying as net investment hedges Non U.S. dollar borrowings gain/(loss): Recognized in Other Comprehensive (Loss)/Income 45 (134 ) 48 Year Ended December 31, 2018 2017 2016 Dollars in Millions Cost of products sold Other income (net) Cost of products sold Other income (net) Cost of products sold Other income (net) Interest rate swap contracts $ — $ 23 $ — $ 31 $ — $ 36 Cross-currency interest rate swap contracts — 8 — — — — Foreign currency forward contracts 4 14 12 (52 ) (20 ) (36 ) December 31, Dollars in Millions 2018 2017 Commercial paper $ — $ 299 Non-U.S. short-term borrowings 320 512 Current portion of long-term debt 1,249 — Other 134 176 Total $ 1,703 $ 987