Yes, Neil, so let me hit on the working capital piece first. So negative $1.4 billion in aggregate, about $2.6 million of that is a function of inventory build. And so we did have some partial offsetting benefit in payables and receivables, and that was driven by 2 items.
One, the rising price, the absolute rising price environment generally is positive for net AP/AR. So we saw some benefit there. But we also benefited on receivables by collecting, in the first quarter, cash from fourth quarter inventory drawdown, and that was several hundred million dollars that showed up in there.
But on the inventory build, it's a sizable build, and I would say, it's really a function of both commercial opportunity inventory as well as some operational-driven inventory. And the way to think about that is the operational barrels will turn into margin at a future point in time, like the intermediates that we've talked about.
The commercial inventory build, those will generate a return that will be in excess of anything we will realize on cash balances. And fundamentally, it's all still sitting in a liquid asset on the balance sheet. So that kind of talks to the working capital. And consistent with normal practice, you would expect that inventory to come back down in the -- towards the end of the year, and you'll see some of that cash coming back to us.
In terms of balance sheet and the leverage levels, we are above our targeted range, so 25% to 30% target range. Still comfortable with that target. You'll notice that we've been leaning into the share repurchases quite heavily, and that's a function of our confidence in the business, in the outlook, our growth that we see coming in terms of the $14 billion of mid-cycle adjusted EBITDA. And so it feels like still a pretty compelling opportunity for us to be buying shares back even if, in the near term, it's at the expense of that leverage metric. So still expect to get there to that level. That's still our objective.
And the other comment I'd make on leverage, the other metric, the other way we look at this is the non -- or the much less commodity-sensitive businesses, the Midstream and the Marketing and Specialties business, is our ability for those businesses to basically be able to bear the debt that the company has. So on a combined basis, that's circa $6 billion of EBITDA generation.
And if you think of a typical leverage multiple for businesses like that, call it 3x, that's $18 billion of net debt, which is roughly where we are. And so that's the other measure we look at. And that keeps the Refining business avoid that volatility being part of that, the way we look at that debt level. So it keeps us very comfortable from a balance sheet standpoint.