U.S. corporate investment-grade borrowing costs have never been lower, while high-yield rates are close to record lows.

Buyback covers dollar- and euro-denominated debt; offer expires in early October.

Whole-business securitized bonds enable lower-grade companies to borrow at investment-grade rates.

Banks are just one element of the big slowdown that's expected in new corporate bond issuance in 2019.

Company pushes debt to new high in order to continue funding new shows.

If companies decide to repatriate overseas cash, they're likely to issue less debt.

If companies decide to repatriate overseas cash, they're likely to issue less debt.

Comcast, 3M and Wal-Mart among those buying back debt.