Aug 31 (Reuters) - BHP Billiton (LON:BLT) Ltd BHP.AX
* Unit prices 1.25 billion 2.125% notes due November 2018; 600 million floating rate notes due April 2020
* Unit prices 1.25 billion 2.25% notes due September 2020; 650 million 0.75% notes due October 2022
* Unit also prices 750 million 3.00% notes due May 2024; and 750 million 3.25% notes due September 2024