By The End Of The Year, Shell-Branded Gasoline Stations In Texas Will Be Owned By Saudi Aramco -- March 8, 2017

Details here. This is not new; simply an update.

Later, a reader wrote:

Motiva was actually an offspring of a prior union.  Texaco and the Saudi's began the union back in the 1980's.  The Texaco half was then jiggered around to include Chevron about 10 or 15 years later, and after some time, that same half was jiggered around to include Shell.

Very few people outside the industry knew that Saudi Arabia had so beautifully positioned themselves - originally as owning half of the consortium that controlled the largest refining capacity in the USA.  Then subsequent to the current split, having outright ownership of the single largest USA refinery.

Yes, that is accurate: after the split, Saudi Aramco has the biggest refinery by far of the three that made up the joint venture.