As anger and controversy continues about bonuses paid to executives at firms such as A.I.G. that took government bailout money, one that has not — Wal-Mart — has quietly handed some 1 million rank-and file-employees almost $1 billion. The $933.6 million in bonuses was an increase of 46.7% over last year. Wal-Mart, the country’s largest employer, saw its U.S. work force grow last year by about 33,800, to 1.45 million.