.4 billion in 2016 . 2022 during the fourth quarter of 2015 , schlumberger made a $ 500 million cash investment into a new spm project . schlumberger is obligated to make a further $ 500 million cash investment into this project during the first quarter of 2016 . 2022 during 2015 , 2014 and 2013 schlumberger made contributions of $ 346 million , $ 390 million and $ 538 million , respectively , to its postretirement benefit plans