It's not as ridiculous as it sounds. $100k per US household would only cost ~$10 trillion, which seems to be within one order of magnitude of the $1.5 trillion we just dropped without batting an eye.
Yeah, but my point is, if you take this to a ridiculous extreme ($1B per person), this would surely cause a disaster. So somewhere between 0 and this extreme, it goes from having little effect to having a big one, and I suspect it may be non-linear.
The $1.5 trillion was in basically short term loans (bond repurchase agreements) whose purpose is to increase liquidity of financial institutions that have assets generally in investments.