Diageo Plc, the world's biggest distiller, and computer-services provider International Business Machines Corp. led $27.6 billion of corporate bond sales in the U.S. this week as relative yields on investment-grade debt rose.

Diageo, the seller of Johnnie Walker Scotch whisky and Guinness beer, raised $2.5 billion in a three-part offering and Armonk, New York-based IBM sold $1.5 billion of debt, including seven-year notes at a record-low coupon, according to data compiled by Bloomberg. Sales for the week compare with $32.6 billion in the period ended May 4 and a weekly 2012 average of $30.1 billion.

IBM and Diageo were joined by Berkshire Hathaway Inc. in tapping the bond market, showing investor appetite for the most creditworthy corporate borrowers even as political turmoil in Europe threatened to unravel the region's common currency and disrupt the financial system. Yields on investment-grade debt in the U.S. touched an all-time low this week.