How can I iterate two list of maps at once?

iterate_proposals_customers.exs

defmodule IterateProposalsCustomers do
    def input do
        proposals = [
            %{customer_id: "5202845", other: "foo"},
            %{customer_id: "9778978", other: "foo"}
        ]
        customers = [
            %{id: "5202845", name: "foo"},
            %{id: "5643635", name: "bar"},
            %{id: "9778978", name: "baz"},
            %{id: "3423454", name: "boo"}
        ]
        {proposals, customers}
    end

    def run(proposals, customers) do
        customer_ids = Enum.map(proposals, &Map.get(&1, :customer_id))
        customers_id_names = Enum.map(customers, &{Map.get(&1, :id), Map.get(&1, :name)}) |> Enum.into(%{})
        Map.take(customers_id_names, customer_ids)
    end

    def run do
        {proposals, customers} = input
        run(proposals, customers)
    end
end