Walking dog looked up observed a very bright white double line

While walking dog for nightly constitutional was headed home looked up and observed a very bright white broken double line moving at an extremely high speed from west to east in the sky. If not for the illumination I would say the object resembled a con trail from a jet aircraft. In the time it took me to enter the house scream at my wife to come look at it and go back outside it was already reaching the east horizon line. The object must have been very large aand it was at about 20 to 30 thousand feet in the air about the same height as as normal flight pattern for commercial aircraft. No engine noise or sonic boom was heard. Never seen anything fly that fast and it was gone before i could even get my phone to try to photograph it. The speed had to be incredible due to the distance that was covered in such a short period of time. Quite exciting only wish I could have got a photo for you.