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Share based compensation Share based compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Share-based compensation expense
The share-based compensation expense for our share options and Restricted Stock Unit ("RSU") plans in the Consolidated Statements of Operations are as follows:
 
Successor
 
 
Predecessor
 (In $ millions)
Year ended December 31,
2019

 
Period from July 2, 2018 through December 31, 2018

 
 
Period from January 1, 2018 through July 1, 2018

 
Year ended December 31,
2017

Share-based compensation expense (1)
5

 
—

 
 
9

 
7

Total share-based compensation expense
5

 
—

 
 
9

 
7

(1) 
The $9 million expense for the period from January 1, 2018 through July 1, 2018 included a charge of $6 million for schemes cancelled on emergence from Chapter 11. This was classified within reorganization items.