ExxonMobil (XOM -0.88%) is already the undisputed leader among international oil companies. The oil giant delivered industry-leading earnings, cash flow, and shareholder returns during the third quarter. It owes its leadership to its advantaged resource portfolio, which features several world-class assets that generate high margins. The oil company believes its best days lie ahead. It recently unveiled its new corporate plan to 2030, which would see it deliver significant incremental earnings and cash flow ...