I don't have SpaceX numbers. But, a constellation like this was supposed to provide ~200 Gbytes per month for 5 billion people, which works out to ~3000 terabytes per second or ~5 terabits per second per satellite at a minimum. (More if they are modeling the ocean.)

http://www.popsci.com/samsung-wants-launch-thousands-satelli...

ED: Here is the paper. https://arxiv.org/ftp/arxiv/papers/1508/1508.02383.pdf

In terms of latency, not raw capacity.