How to have full-width horizontal lines in Microsoft Word?

How can I have full-width horizontal lines inserted between the lines of a long text? I do not want to use Ctrl+U to add underline to the text because it does not add lines to the empty spaces. Also adding lines via the "Insert Shapes" menu seems not accurate and somehow hard to do for multiple lines. Is there any straight forward way to add full-width line between the lines of a text? I also thought of simulating this with a table and pasting my text in the rows of a table with bottom borders. The problem with this method is that all of the text is inserted in the first row of the table, while I want each line of my text to be in a separate row.

• microsoft-word
• formatting
• text-formatting

It's hard to tell what's the optimum desired vs. limitations of available solutions you're willing to settle for. But to confirm a couple of points, by full width, you mean margin to margin? Between blocks of text, you want a single line that equally divides the gap? Regarding the table approach, what is the problem with pasting the text into the rows you want, or splitting the text into additional rows?

I read this to mean that you want a margin-to-margin line under each line of text in a paragraph. I have searched for that solution and not found one. The answers below give you single lines wherever you manually place them or lines between paragraphs but not between lines within a paragraph.