Alongside strengthening each of Marathon's operating segments by geographically diversifying its refining portfolio into attractive markets, increasing access to advantaged feedstocks, enhancing its midstream footprint in the Permian basin, and creating a nationwide retail and marketing portfolio that will improve efficiencies and enhance its ability to serve customers, the proposed transaction would be meaningfully accretive for shareholders by generating about $1 billion of tangible annual run-rate synergies within the first 3 years, as well as enhance Marathon's long-term cash flow generation profile, Heminger said.