wolframalpha:

So just how high is the US debt ceiling? According to Wolfram|Alpha, if the amount of the debt ceiling, $14.294 trillion, was a stack of $1 bills, you wouldn’t hit your head for one million miles!

That is 4.2 times the mean distance between the Earth and the Moon:

And because we can, here is how long it would take light to travel that distance:

So much data!