They are raising $1,320M and using it to buy back shares at their current share price, which is given as being $11 per share.
Therefore they will buy back $1,320M/$11 = 120M shares.
The nominal value of the shares is $1, and therefore as per normal financial accounting ‘rules’ the share capital is reduced by 120M x $1, and the extra 120M x $10 reduces reserves.