Our $4,250 million of senior notes were issued under US shelf registration statements. If the

Proposed Transaction is completed, a downgrade in the company's credit ratings below

investment-grade would trigger a change in control offer under existing debt securities,

except for the notes issued in 2016, and the company would be required to make an offer to

purchase all, or any part, of the senior notes at 101 percent of the $3,750 million outstanding

principal amount of the notes to be repurchased, plus accrued and unpaid interest.

what does this mean?