And nothing referring to WPZ involvement.
WPZ is a subsidiary of WMB. As such, WPZ is involved whether minority owners wish it to be or not. Where WPZ is not involved is they have no vote in what happens. The outside members of the WPZ board will be involved to ensure WPZ receives adequate value in any required transaction, but that's it. Partnership fiduiary responsibilities are lower than corporate fiduciary responsibilities.
Anti-trust matters involve companies and all subsidiaries. Just because WPZ is a separate legal entity does not exclude its assets from anti-trust review.
Selling a half interest in a pipeline will provide substantial breathing room in the capex budget into 2017.