Moody's Upgrades Outlook on US Debt

Moves it from 'negative' to 'stable' over deficit drop

Moody's Investors Service upgraded the outlook for U.S. government debt to 'Stable' from "Negative" and affirmed the United States' blue-chip Aaa rating.

The rating agency cited a surprising drop in the federal deficit — the difference between what the government collects in taxes and what it spends. The U.S. government is on track to report its lowest annual deficit in five years.