Uber received a 17.5% stake in Didi as part of the deal [1], which is worth ~8.75B given their most recent raise at a ~50B valuation [2].

[1] https://www.bloomberg.com/news/articles/2017-04-28/china-s-d...

[2] https://www.wsj.com/articles/didi-chinas-uber-raises-5-5-bil...