A family of Microsoft word processing software products for creating web, email, and print documents.
The step that Stefan omitted (based on his screen shot) was selecting "New documents based on this template" instead of "Only in this document." Assuming the document is based on the Normal template, then the setting should hold for all new Blank Documents.
Yeah, I omitted that step and added it later. :-)
Of course, any modifications made to a style and added to a template will only affect future documents based on that template. You may always be left with some documents that are unaffected by the modification (unless you use "Automatically update document styles" in the Templates and Add-ins dialog box, which we don't generally recommend).