Minister Heng Swee Keat's promotion will take effect on May 1 and he will retain the role of finance minister of the regional banking and transport center.
Abe will visit Washington on April 26 and 27 to discuss a range of topics such as North Korea, while Trump is likely travel to Japan again for a Group of 20 summit in Osaka in June.
The General Elections Commission of Indonesia (KPU) estimated a 77.5 per cent turnout and the government declared Wednesday a national holiday to ensure maximum voting.
Most opinion polls give Widodo a double-digit lead but the opposition has disputed survey findings. Some recent surveys have shown Prabowo catching up.