Companies raised at least $20 billion in the bond market Thursday.

Companies raised at least $20 billion in the bond market Thursday.

Corporate issuance fell this week amid news of central banks efforts to stimulate growth.

Companies issue at least $16 bln in debt.

Companies issue at least $16 bln in debt.

Walgreen sells $4 bln of debt, Transocean sells $1.5 bln.

Demand for high-yield debt gives borrowers more power to dictate deal terms.

Corporate bond sales see busiest start to a week since March.