Gross profit. Not Net profit. They made a tenth of that after all other costs are considered. [1] 13.6 billion spread over 2.1 million employees works out to about a $6500 per year raise or about $3.10 per hour given 2087 working hours in a year before they're in the red. It'd help a bit, but nothing life changing. You're vastly overestimating their ability to raise wages without raising prices.

[1]http://www.marketwatch.com/investing/stock/wmt/financials