Very high: about 67.87 miles.
Approximately 67.87 miles high.
Approximately 67.866 miles high if they are in pristine condition.
Approximately 55,989.58 miles high (yes, really).
A stack of 1,000,000,000 one-dollar bills would be about 358,333.33 feet tall or 67.87 miles high.
You'd better find a tall ladder: the stack would be 3,583.33 feet tall.
A one-inch stack would contain about 233 bills.
17 million one-dollar bills would stack to about 6,091.67 feet high.
If they are one-dollar notes, the stack would be 47.51 miles high.
195 100-dollar bills would be 0.84 inches tall.