We don't have a policy beyond "be flexible". Some teams/managers are more open to full-time remote, but everybody within my product line (12 teams spread across US and Bangalore) are ok with part-time and full-time remote. I doubt we'd hire a manager that didn't agree.

Younger employees (college hire to 3 years or so) tend to be hired locally, with increasing levels of work-from-home allowed as time goes on, but we're flexible from day 1 in terms of "work from home to let in the plumber" type stuff. Generally, after a few months, we'll allow regularly scheduled work-from-home for "I need T/Th to do day care runs" stuff. And several a year go full-time remote, usually to flee DC real estate prices and traffic.

Mid-career employees, we'll hire remote from day 1.

With 1/3 of my product's staff in Bangalore, we have to be good at remote work anyway, so there's little, if any, cost to allowing US-based employees to work wherever they want.