Generally speaking; in broad terms — used to give a rough summary or main point while skipping details.
大まかに言えば、この計画は二つの段階に分かれます。
Generally speaking, this plan is divided into two phases.
大まかに言えば、問題は予算不足にあります。
Broadly speaking, the problem lies in a lack of budget.
大まかに言えば、彼の主張は同意できますが細部は異なる。
In broad terms I can agree with his argument, though I differ on the details.