WASHINGTON - John Kerry views his first trip as US secretary of state as a listening tour, but the leaders he meets will want to hear whether he has any new ideas on Syria, Iran and the Israeli-Palestinian conflict.Kerry leaves on Sunday for London, the first stop on a nine-nation, 11-day trip that will also take him to Berlin, Paris, Rome, Ankara, Cairo, Riyadh, Abu Dhabi and Doha before he returns home on March 6.It is an introductory trip for a man who needs little introduction abroad after spending 28 years in the U.S. Senate, all of them as a member of the Senate Foreign Relations Committee and the last four as its chairman.